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 0x2c125ef2587b01706c27aaa8cc4526474018e3b09a100d1265ea742d88d73259. 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/444a5b31-76ca-4b7b-a240-c92bb4acf40a.json and https://artists.proofprofile.net/proofs/artist/444a5b31-76ca-4b7b-a240-c92bb4acf40a.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 0xe3ffecb6e22c1d2ecbae6b5b72c53ac13ece9972eece240539b60e07d6778415. Chain 2 (Bitcoin): anchored in block 958547 (2026-07-18T12:44:05Z), 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/TCAEC1963418.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x562e4714db18450355f7f88df2df8da1d53364aa6761649ca44fa33257223846. 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/TCAEX2057496.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac1508837747cde489eade68fea5dfbb40afddc00a0d413507b4623ec71b0512. 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/QZ5FA2150023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb332a87302e579743123b23b3713c271f8c4c6ae3826377827201d9b4e466fcf. 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/QZ5FA2150028.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8b88374a2db291cb7027efbbdf23455b7f899a072cc0547defc4a96af71da74. Chain 2 (Bitcoin): anchored in block 959069 (2026-07-21T22:32:59Z), 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/QZ5FA2250040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff835d788ec14f2b58511ea9ba2a134deba479f2ea7f45917bf0b34489fd363c. 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/QZ5FA2350036.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f8b068434ef09caad4243b18ceb364a2fbe603f58e3d2368a5d78859d1dc653. 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/TCAHZ2410124.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe72510148e4b1a223ac2368fdd1d7819c23631fe2b372830a591057d1043b4b3. 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/TCAHZ2410164.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3ffc70fe7c61b02343d6e63c867b5f7df2e9841285e539f1b9645d33d505d37. Chain 2 (Bitcoin): anchored in block 958576 (2026-07-18T16:22:28Z), 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/TCAHZ2410182.
Last One Left (feat. Missy Elliott & Lil Gray)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54fc30ff2f07f781442e228584b40c0828ff764707a838ae169f7ea18efc7132. 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/QZNMY2304782.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xccc8d49d95553667a7e1ac02e1188b7069ba78bc0b02225c710b9e14082a5b20. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QZHNB1931478.
LAST ONE LEFT FEAT. MISSY ELLIOTT & LIL GRAY (CHOPNOTSLOP REMIX)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42c5d91ca3e9a7ee1aa4022dba8904cd764994f8596bcb14ad585c4662e975ef. 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/QZNN22334060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37d25be8e3e9ce287ae6028805fe525b4cbb266cc98118f2def57edce05704dd. 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/CA5KR1930020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa224ff4b0d07da1c2fc94ef6de26d5529851ad2a1ca46fd6aab0bf19d51c9a0c. Chain 2 (Bitcoin): anchored in block 954130 (2026-06-17T19:07:14Z), 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/CA5KR1845568.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4f603697af83a6d58c831fc39de7dd126822a89fc56ceae72569c20e9e4d146. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/CA5KR1845569.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6cb9b5a875452a19e3779c57235dcb6d289b5ce87c928b2e86783e7521650066. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/CA5KR1845570.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x939c3347513eb74ee804ee8ba8b22617202ca866b9c2b4314beeeab743383d58. Chain 2 (Bitcoin): anchored in block 960459 (2026-07-31T20:22:46Z), 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/CA5KR1845571.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3fb50caf3a396a73afd4452828a08d1fdb6559e6ca2227920ac3c428232e70d1. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/CA5KR1845572.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1b11802890fd3f49c51f4ffd829b17310239943b0109bd21e1d30eec748ebb2. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/CA5KR1845573.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c303c57bfe6cc24329940b62159b66085b40e12359721769eb1226691808b17. Chain 2 (Bitcoin): anchored in block 960337 (2026-07-31T02:51:48Z), 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/CA5KR1845574.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x475d517c35c30144e48c1204e5a14fe42c174fa4b22863eaa3f4a52179125a29. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/QZFZ42380501.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25f76b3e9e6861fbf07e567ac70974fe364686f85509313bc3ddbf6e2f7e1c01. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/QZHN82485451.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11adae82d6bc68cb676cc105d3a922c818914ba1b0bcef8ccccb00f01fde5c18. 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/QZK6Q2377960.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6ccdab2013f003ecee27ebb6417f8c48d329f369549f9febe02cd5f0cd91648. 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/QZK6Q2377962.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf978cdcb3afb6391f36d0e6920c02caa4902bad34845f3d27061acce3eaf3df4. Chain 2 (Bitcoin): anchored in block 960160 (2026-07-29T22:48:59Z), 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/QZK6Q2377964.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42651f8ae6c806e3b718b91e34a68b602cdb4303387bbffd75b5237e8731edf5. Chain 2 (Bitcoin): anchored in block 960198 (2026-07-30T02:21:55Z), 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/QZK6Q2377971.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd269d8e698e7ea42d1ee873b9aa01e33f508351c37cd4df1648508e7c205fc7a. 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/QZTAW2203213.