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 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 0x081a92fb58afd63817e8f58e1f8c39c1f50b1c098a6bb483f3f271a67d30808c. 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/e20f9947-bab5-42da-8dac-cfbc17d325d4.json and https://artists.proofprofile.net/proofs/artist/e20f9947-bab5-42da-8dac-cfbc17d325d4.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 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 0x74373d1e97fd0dccacac97c3dc57452196cbca2551b3cf6611bb7081550d7a67. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/QZXLZ2332314.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1856d6400174740b755126108f3145fcb16e1601e2de1a3abbac9f0ba74f49bc. 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/USPWN1300523.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb0f4a926daaa132c593a026112363a7122e8979a7b925fc903f91a628490551. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T03:46:57Z), 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/USPWN1300525.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00ca59fb9ebb14fee1f3ae05263ad7023570d1fd38c781d4b21cb9d75c391ebd. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/USPWN1300528.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x947b5d28926cb1d203cea833dc4d170044d4a4a2e77e782d445ae0386b5f6697. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/USPWN1300531.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2be2df9b72667defca009e7479a913aecaa8162b18ccf314ad15b73e19887fd. Chain 2 (Bitcoin): anchored in block 958448 (2026-07-17T19:49:21Z), 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/USPWN1300539.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec75f64232409a966ad15f8b8b0069ef840a711c8d45d2fb37927ff030819546. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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/USPWN1300547.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x888ab4c1cecfcfc5cd9e470ab28f26a774dec2adf8d8f3042de438174f5b96d1. Chain 2 (Bitcoin): anchored in block 958558 (2026-07-18T13:44:16Z), 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/QM6DC1570953.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x617b7484dab300941ae10292f5b61b70dae3cbe01a3890fd249b7f3c11a5fd23. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QM6DC1570954.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60e62d0f9c8aec2f650382a033d343d1a3aa6aa178e0738604663014d99ec304. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QM6DC1570956.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a144faa497729a3bdf8aa9f6a84eea965f3b0b8ae17943cc6aba09bc44757a0. Chain 2 (Bitcoin): anchored in block 958067 (2026-07-14T21:26:15Z), 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/QM6DC1570957.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53ba8509151529ce2104a201711d012500de4a06d666d6664af3985f1702a82a. Chain 2 (Bitcoin): anchored in block 958163 (2026-07-15T16:27:45Z), 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/QM6DC1570960.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd5c48cb1e857967e578909c38682fc1118a1265736e2202d4780082b234e4e5. 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/QM6DC1570962.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf01e558333951f8f16e92948a60b29bb8aadd153f7ce1f88c57d122f8d86380. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/QM6DC1570963.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd5c48cb1e857967e578909c38682fc1118a1265736e2202d4780082b234e4e5. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QM6DC1570962.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf01e558333951f8f16e92948a60b29bb8aadd153f7ce1f88c57d122f8d86380. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/QM6DC1570963.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde6e020eeacaab3e925c311390162219fde2f76f5dd2dbbfa880aaa6cea617b5. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T07:32:40Z), 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/QM6DC1570966.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84eb49d6475c027dc1959a3ee4d2f69a0393696768309dc75b9cc589f4f64ade. Chain 2 (Bitcoin): anchored in block 959107 (2026-07-22T09:57:42Z), 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/QM6DC1538269.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2164e6481528d187995deefe712a729d35aaf4acd9d6b88bfc52cad9a16d5fae. 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/QM6DC1538286.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68acea491ca21bfe0bf908436a0b8a07f2f9a847e6a99f45a3a59a41ad51bf49. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/CA5KR1833527.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcbe3a970355648abd6269264c2f3cfadd5774f1bf268fe072b6201d8d101fe36. Chain 2 (Bitcoin): anchored in block 958256 (2026-07-16T07:22:18Z), 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/CA5KR1833530.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3fdef5f1af5a62a2ddd9da423ca9c8106239453d7ef5b5a1099614977c289de. Chain 2 (Bitcoin): anchored in block 958447 (2026-07-17T19:47:19Z), 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/US3DF1838157.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8e9ccc80c622cff8bf3fab679989226eb694a18e75f3c55e5d6f5facef329e1. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/US3DF1838170.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x574ac39c216bb2104cb6d24c30cbf4fb689e3188eaec996fca736a5a8bbc81dd. Chain 2 (Bitcoin): anchored in block 958746 (2026-07-19T15:36:35Z), 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/US3DF1838171.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7fece65c92f810885ffbb937eed98cbd779cc8b2d21ef11dca2fb53eed78ff7a. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/US3DF1838172.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ca1e8cb3a71c0c1914a95b2388a967b553a70301b661ca94f47ea2ca1c7c7c2. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/US3DF1838178.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf21991ecf8951b95ea43097889c48916843c8d05d98f74d2d22ae86964e94915. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/QZNFJ2405865.