Katarzyna "Kasia" Kowalska (; born 13 June 1973) is a Polish singer, songwriter, producer, and actress. She belongs to the top rung of most frequently broadcast Polish rock artists. Kowalska is one o
1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. Open OTSProofURL → extract Bitcoin block number → must equal OTSBitcoinBlock 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Read CopyrightID inside OTSCanonicalRecord → must equal the CopyrightID above 5. GET OTSVerificationAPI → pre-computed 6-check result from server 6. If all match: this entity was registered on CopyrightChains at OTSTimestamp, independently verifiable on Bitcoin
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda67427647a6aac0068b795ff451d8d929faf92db015f742ff66f203d4ec7b27. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d2169fe9-16fb-4540-a7a7-06561337859a.json and https://artists.proofprofile.net/proofs/artist/d2169fe9-16fb-4540-a7a7-06561337859a.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa80d7e6fe02ecb2571119bb3c98a838b3dd2450d567bb8dccab35f9fd5cf9f06. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/PLUM70700666.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c222577d6c26fad6b2a109116ff72c3c26ec51cef1d147ba4dc7a83ec472b3f. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/PLUM70700669.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57da40343233579361b3c30a364895e27127412e03f68795555b91c89ff571ef. Chain 2 (Bitcoin): anchored in block 957880 (2026-07-13T16:39:18Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/PLUM70700672.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee8d098a2dd3a33f9674d37df7b46a09cc19d8ae462cc58aeecd4bbb5437c8c5. Chain 2 (Bitcoin): anchored in block 958216 (2026-07-16T00:00:34Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/PLUM70700675.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x110c5931b1da89039e02cbbc789392872b51fd89a14c911366e1ae4904cc1803. Chain 2 (Bitcoin): anchored in block 956576 (2026-07-04T02:06:47Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/PLUM70700676.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f30d45c0d015e17b6b6a611b13e95aeddc0d5a5b9c7bb18ca14a562a2736f14. Chain 2 (Bitcoin): anchored in block 958508 (2026-07-18T06:27:01Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/PLUM70700677.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb51f84d642266a0c5a80370e1892a075ac804114c4dffb18f86e48acebe28705. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/PLA219600052.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf5e38494496fc8dff657054e3d2a6af3377260de2505349106370c43a1885f9. Chain 2 (Bitcoin): anchored in block 956857 (2026-07-06T01:26:17Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/PLA219600054.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09bb6c692a1c4be0833f9909712c7105b7623b8d8fc82dee38a69632863fa34f. Chain 2 (Bitcoin): anchored in block 956476 (2026-07-03T09:04:44Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/PLUM70700754.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x599e7028db2b34d286d7a663d7c427d77b20a57109cc90a9cdf5ce6daed95beb. Chain 2 (Bitcoin): anchored in block 958783 (2026-07-20T00:07:34Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/PLUM70700761.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0d0c0c876ea88b5088e7c519417a29f7b5cbef884dda3770d0d48a3602467d1. Chain 2 (Bitcoin): anchored in block 958987 (2026-07-21T09:04:56Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/PLUM70700751.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x978f3eac4694799dea6287bea2a361449bd9d3bd75ab8af0e979119a510dc4ac. Chain 2 (Bitcoin): anchored in block 958212 (2026-07-15T23:25:50Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/PLUM70600015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4cb0911079e7ef9dc99625e9efdc3a3d060ef215afc9df0fdedad096f9320d0. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/PLUM70600014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7258e841c45a389321016656cff47d73b43bb0c20f722c1497ff4b3a67de233b. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/PLUM70600005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31ca840cfa86825d89b285e48ac15d77ed609e3deb60e3b2b412b92d4a3527ff. Chain 2 (Bitcoin): anchored in block 958544 (2026-07-18T12:14:37Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/PLUM70600008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c40f59f655fab796b6d23f20439e87e041d039ba0ce62a8645d6b1dc9bd2f79. Chain 2 (Bitcoin): anchored in block 959058 (2026-07-21T23:32:26Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/PLUM70700682.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa1a9b77225380a43aff1dc27afd3a9f1685cdb2fff53befc48c4f5886fb9869. Chain 2 (Bitcoin): anchored in block 957874 (2026-07-13T15:43:57Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/PLUM70700683.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3831cb1bd31fd3c9722ab0b248f3dcf89ed461416276676df9080c8e4f504de. Chain 2 (Bitcoin): anchored in block 958867 (2026-07-20T13:39:43Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/PLUM70700685.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a8e47e369287fa788b5ed85e7257368bbfac35aed983f6b454f5e4f03779ec1. Chain 2 (Bitcoin): anchored in block 959026 (2026-07-21T18:20:56Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/PLUM70700689.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27aeeefa3479a82292294fcb90c254e0be9cc8af93c710547132c5e9415a573e. Chain 2 (Bitcoin): anchored in block 958808 (2026-07-20T05:31:55Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/PLA210400280.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c85a7bbd9255c6aa8c4f124640a67eb4476f5909b855ade0ce765d3b3271a84. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/PLUM70800555.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c79ad697505b89639737d60f68fdacf3bc0bebd85a7d32e1f5836f393ba0c3b. Chain 2 (Bitcoin): anchored in block 956484 (2026-07-03T10:47:44Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/PLUM70800552.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb88532f7e9041854705e548957ec746f880707ad83eabc52f64aca6cdb4a0939. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T17:03:44Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/PLUM70800557.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd9e451e0d3351bb70bd7bd7deaa13506f03ed0d329f2146d68fa5697b811920. Chain 2 (Bitcoin): anchored in block 958185 (2026-07-15T18:19:04Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/PLUM70800559.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbdf5500305b8a420b173c81b3ddf6aa3064840435d04e30245cd194df901416f. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/PLUM71000878.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d29ef5a3cf1b9c8b91c97017936932039efc0b8544063c9408cef7828a716d3. Chain 2 (Bitcoin): anchored in block 958749 (2026-07-19T17:47:37Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/PLUM71800550.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e18780c889bed8d1886300573275ba24cb553f4543f0dd93b5dabc39faae2c8. Chain 2 (Bitcoin): anchored in block 957882 (2026-07-13T16:48:10Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/PLUM71800120.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x091ac61895087deb1d41d23aa82daf625e882faacd599dc1729423b443e05c88. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/PLUM71800551.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88e1ed7101f5046893460f5506629388a1a43038da36cce5ca922de35a244d66. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/PLUM71800552.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0ca5e9352ac2c023b1109adce3cf413b6b5707c6d1eba616d8098276da314d1. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/PLUM71800554.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5873aa2192b18e0fc437abca1d212e1cf0de92fa5696e2e54f4fad091fc6b746. Chain 2 (Bitcoin): anchored in block 958432 (2026-07-17T15:43:17Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/PLUM71800559.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xefadd5724f91f86387af6bd13f21110d2e247bb3aacadfcc3d021001bf6fc1ea. Chain 2 (Bitcoin): anchored in block 959009 (2026-07-21T15:06:00Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/PLUM71800608.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd880b426fbb0aae52c9db59c7ae64b958978fb2c3dbec129f36dc99803a8d41. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/PLA961900377.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad7617465f6126e70668360062f2136c6f6b481414038430f5140514e4c2ea83. Chain 2 (Bitcoin): anchored in block 956891 (2026-07-06T07:16:32Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/PLA961900378.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe86a7a2328b78b3cb06e6b531158b8cf6cd8b4507554feeb8693fa0a7bf2d402. Chain 2 (Bitcoin): anchored in block 956894 (2026-07-06T07:53:57Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/PLA961900379.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x064ba681f2722375fe912004c0ad7a0ef22d630a7fdab0419d2fe6039139cf82. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/PLA961900381.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd109934313284fbac757b9463559baa27955c26212c040b5e796e35c21e05625. Chain 2 (Bitcoin): anchored in block 957065 (2026-07-07T16:43:21Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/PLA961900383.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x160c1218aac42f16d047399e8880c2c6f4367aec119efb3d2c03c161d79a7209. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/PLA961900384.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5681f82dee20110b76b884b0db9ec15caaeee451e3ee11fdfc12b2fab097f56. Chain 2 (Bitcoin): anchored in block 956891 (2026-07-06T07:16:32Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/PLA961900391.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa53cef0694be1703ba41743cc66d64fa76439332c3d866bd401264d12c8afd66. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/PLA961900386.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46583d24441dc7bae3a7f7bd83e1c39ae024717d5ff4a1d87178ec14b465fe4d. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/PLA961900389.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93c3801e8602028c7d10fc07e3bbfbc2c21c5f4061ce291f29d1cc0c80aa9de4. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/PLA961900380.
1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa37fa1baa0fe1cc7819d4ea7aa7c570a3f2e386491b8da3e2fbb3cf7d4165ce9. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/PLA961900388.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x791fbc214978435a5d1fad09a736c80c8826e4014b8b8afd80976445c75d528a. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T15:24:15Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/PLA961900390.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba7e914a376de8aee2f86b22bba44612cfa564eda6d246e2b4cdcb98cf325b60. Chain 2 (Bitcoin): anchored in block 960099 (2026-07-29T11:30:20Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/PLA961900382.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x399cf2350e41cf8b8952043ac985dab891a24d6f5416b77904bbbabf21a5e853. Chain 2 (Bitcoin): anchored in block 960150 (2026-07-29T21:51:49Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/PLA961900392.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff96eb553e7649df5cdcd8fde230833b25a534704b3fcbdbcd349e8bc5defe3c. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/PLA961900385.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27c24bbbda081d318638e5b0432a5f819d89925d658c7a7ebb37e4b6f87b4485. Chain 2 (Bitcoin): anchored in block 960164 (2026-07-29T23:23:05Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/PLA961900387.
Kasia Kowalska Live Pol'and'Rock Festival 2021
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19f67947e99bb67005c92786a756a554eab0eefa6896506bca3b383ca589bf42. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/PLUM72400486.