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 0x59a507c4c25d027a8fc94ab5eeca11cca1a20101fa17b6df2730b1cf47a9db8b. 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/b3fabd72-020f-45f9-9eb8-795e3047a7fe.json and https://artists.proofprofile.net/proofs/artist/b3fabd72-020f-45f9-9eb8-795e3047a7fe.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 0x863b9a5fff30d16e89e5d5a388da00c0ba9501579abc77de46713d61878236f8. 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/US3DF2004012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9bf50a048a638b1aaed9dab02aad0ac7c69fc9c1f70dc7013f3ffe1552e36cc. Chain 2 (Bitcoin): anchored in block 958074 (2026-07-14T22:45:25Z), 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/US3DF2004020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95710706dd7750784a298391079c984182c0126e518b2d4c6f1b5a760bc18bdb. Chain 2 (Bitcoin): anchored in block 958063 (2026-07-14T21:07:34Z), 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/US3DF2004028.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85ad99f21b701e9373c0d4a58d50532cd03cd3c8d530672b910f0943d0c0a777. Chain 2 (Bitcoin): anchored in block 958404 (2026-07-17T11:34:58Z), 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/US3DF2004029.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x487605bf18aba75597b7361e89a42da51f5756bc7d167a63e6f5f18965e1f3ca. Chain 2 (Bitcoin): anchored in block 958749 (2026-07-19T15:48:23Z), 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/US3DF2004030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a410a9788fb59f9f572794b34466cced856b54e5ff377f2b4f9bfdb7fbff4f6. 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/FRX452259720.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x730d4dcef083ab9a43bcad205462d9c2b2325620deccf245c53800d15662434e. Chain 2 (Bitcoin): anchored in block 958074 (2026-07-14T22:45:25Z), 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/FRX452247964.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9cbea5dc61a87a33cf2b2f9b9752114131a0a4a0836ce74144834b5d95b6bdd9. 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/FRX452247979.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa21d51d2da965ef42ccb8c3e4251c0e3448bcfa6e58fc2a082d5db7bf1ac084e. 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/DGA062345289.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x505c1e5ebc2af0d746af2635617eb1acf4ed15ccbb3d0b43b23d21f9e571bd17. 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/FRX452259725.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9245df13eaf2eb6203d1aed980b3c6c1ea96c1b38120c2f10423373d368f542. 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/FRX452259727.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99b7916fa319fd6632770fbf9add4767b70ec89bf43c6268d740e0f49e49d0fb. 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/FRX452259728.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab05ca9d49061151754c8aa004def9d2269206429f0b69f1b2f0d20bb503d089. 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/FRX452259731.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5081bfb8fe467c539ee71480c173e8e7bf23883328ae7b3c15a212833001b4d6. 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/FRX452259719.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e8c66ba7f5c4586d50c3ee7b844014dddb10405c906aee84547b63f97f34394. Chain 2 (Bitcoin): anchored in block 958163 (2026-07-15T14:38:07Z), 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/FRX452264077.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57787afd3ea1fd0ffeff61e67e7c37d0294eba51820429553d037a2fac182d53. Chain 2 (Bitcoin): anchored in block 957744 (2026-07-12T19:15:44Z), 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/DGA0R2334268.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ca2a150624ce9a0f39197fd9eefc21cb6aa3c2a3c1e58eacce472a4e2c5c6fe. Chain 2 (Bitcoin): anchored in block 957771 (2026-07-12T23:27:28Z), 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/FR96X2577685.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x807133de0eefe86e9a07b7025efeb7d5ed20971e560d5f314824f175bfcf4131. 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/FR96X2311099.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae7322224a00dd24dc330276b4eedbf30215af55733f7b283ee0aa44a4181e76. Chain 2 (Bitcoin): anchored in block 958152 (2026-07-15T12:00:27Z), 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/FR96X2577686.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xabe995394bea9c8b9ffeb7e0f898337e383fc285ab914db506753938fb90e292. 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/FR2X42500154.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe605cdda6b9693fb12c44cf8377e70ec14a2e0dd9251bfcda35e64d220993f22. Chain 2 (Bitcoin): anchored in block 958324 (2026-07-16T21:05:52Z), 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/FR96X2577687.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x808abd82708583d258e9bd5cbbaef6f382c237119157c432f736a9caec86bc3d. 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/FR96X2577688.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x767f7da85d6a4a4e7146783a4c425e217de1571115150ed12976caeba4e73c65. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T10:20:17Z), 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/FR96X2577689.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x028936b5d63a59a52bc817832fced1c742e24c9e3536c13dba1cad47f85939c3. Chain 2 (Bitcoin): anchored in block 958095 (2026-07-15T04:30:08Z), 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/FR96X2577691.