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 0x1739699df854a774db75d172698a7985b51db7d277aafc00cb2e798d49876b6a. Chain 2 (Bitcoin): anchored in block 953605 (2026-06-14T07:39:50Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/10f44cc3-ec2e-4c69-8bd6-2d1f291450d6.json and https://artists.proofprofile.net/proofs/artist/10f44cc3-ec2e-4c69-8bd6-2d1f291450d6.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 0xc6aba79baa356acbadf82473ffed4a294bff54606e1cdf60f604d6a84a4d47ce. 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/TCAHJ2381142.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8e3dd30e071e1e842de516365ecc91a7bc166b3732ef656d1e1c764eac06c39. 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/TCAHJ2381148.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf052018c64c4164c0ad8e5975182a195636d213aebdccef3eca9976e65d20538. 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/TCAHJ2381152.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56fa062142eb437e145170cb71233bc2a3daf45200a6bb5141f76b4bdb7f600f. 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/TCAHJ2381162.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e0a8568130d8b36bc0e4a77194a547eacebd7c3604b37fb08901ab02a4d49bd. 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/TCAHJ2381167.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ad0c7409d321ea5a6e1e0fb0288565f0d45f8b70b20a0194c0e8620910fc775. Chain 2 (Bitcoin): anchored in block 957055 (2026-07-07T15:12:44Z), 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/TCAHJ2381185.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88a0198d0667c4b8656250d6e85a28ca8727b2fda2472d5f18a99e589df84fe6. 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/TCAHJ2381187.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb846f0197b2efbec6a8eb63ba3f07329bbcd95615541b072fa037af1d39b465c. 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/TCAIZ2485840.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74ffe013c5ffe54d16a0b9f2d88a74ce629308b412b4e85fe2247810dc4ff1ce. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/TCAIZ2485853.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9feafd8bc879e9c97ebe61b4554cb11c532e979c840bfd04db31e1ca60769e06. 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/TCAIZ2485879.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1cea8006804fa7015988654e57899ef76dea25c5911381fd96f2967fbb39c61. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/TCAIZ2485894.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ab49dfeefad9435be71c3dfa51a7f2eb99c54583a7b5e26b791fb8df6d8249b. Chain 2 (Bitcoin): anchored in block 960209 (2026-07-30T05:15:54Z), 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/TCAIZ2485945.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4bf4387a30ff44a7e54950b292c8276dcedf5bb4e83656747d9fe0967c9715e2. 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/TCAIZ2485953.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x378e5fed41d4ab6d66f393c2a0cda075ee256d44ab9ff292a679f0f2a5d22018. 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/TCAIZ2485973.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0778904dc8513a3d7d8eaf44b1272797354b338b87b1833246ab61cee0e2b71d. Chain 2 (Bitcoin): anchored in block 960163 (2026-07-29T23:20:38Z), 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/TCAIZ2485991.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e403ab1a71b728a7c40cfbbd213e265bf2d747d1f783328942e688af0886a2e. 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/TCAIZ2486007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4d8e21932ab8f3a03ca1f4d4d32ed70ef2d0ead3d7f3fdd78a9e5ac72921f03. Chain 2 (Bitcoin): anchored in block 960240 (2026-07-30T09:57:33Z), 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/TCAIZ2486051.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4fc557173b08198af27e123be9ab886d214e81f692cf211b4ae11cba84ca83e. Chain 2 (Bitcoin): anchored in block 960121 (2026-07-29T15:22:21Z), 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/TCAIZ2486074.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f072c377ab69c1be98cd6bcbdd252df8fbd2ceb4bbd3aab2c631c81a435b7a7. 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/TCAIZ2486093.