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 0x85c2d97be07e5a8ee5b3a61fa7d65ef4076a59a7d3830250c29c6f83eaa2c6c1. Chain 2 (Bitcoin): anchored in block 953423 (2026-06-12T21:20:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/44d86ab4-ad77-4c57-9056-e47fadd07f09.json and https://artists.proofprofile.net/proofs/artist/44d86ab4-ad77-4c57-9056-e47fadd07f09.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 0xd1e0234926bbf94aae0449586bce4dd431f175e15be4028ce29c46be980a521d. 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/USSUB0701105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4f3ec8d0d5d73890cb628adeb72152067b9a91c816a2f5d39fd701990cdc756. 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/USSUB0701106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c0cc94d12375c4bd158f3139435484d68c543919e2dbb59b52d0ad714a2e701. 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/USSUB0701107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9daa194b89360610ab10ecc0a05a8efef03b94b06dc4d4d1622def46a834edb. 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/USSUB0701109.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23b0ec39958450f4090f7905dd69983a7a849334dbd117c96a72ed0caaa2b8a8. 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/USSUB0701112.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce335b9f981bfda7a67d9c43b230ab8278493c0fda84f3dafc066b4514bb7be7. 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/USSUB0701113.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90e0292b5b5b76af9f71b13ead0fcb99d73dd4eb8b1dac0a1b1b91e9632d9498. 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/USSUB0701114.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x972c58ccdc2c7765e3ee41cfb3aaebbe87814f91abc862a1d1fcec3d626350b7. 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/USSUB0701115.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b3e62f5bf00a3db3be7626e35903ef714395409674821d80768f5900d523da4. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T18:23:45Z), 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/USSUB0701116.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3e8c1386948086fc43fc62dccd7622120527b820a0a4f246a94a8a055f875d4. Chain 2 (Bitcoin): anchored in block 958319 (2026-07-16T21:34:04Z), 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/USA2Z1811016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4018049a51467c13c96ca6db560c439f7d920caf54c42b9c2678df873e115736. Chain 2 (Bitcoin): anchored in block 958083 (2026-07-15T01:50:31Z), 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/USA2Z1811008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9cbc3b468ad1e7f35fa777ea204c78020585e0571dad78239c9860d9aa6f88a7. Chain 2 (Bitcoin): anchored in block 958728 (2026-07-19T12:24:55Z), 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/USA2Z1811011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32f25e675143ae597a70795111fb83cd74eaacaa265750a7a637ee291bdf4c42. Chain 2 (Bitcoin): anchored in block 957754 (2026-07-12T21:26:22Z), 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/USSUB1826201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee52d27ecff26866161bbc9136c5946dbba9d11214232b3768b7a2c6e5872b35. Chain 2 (Bitcoin): anchored in block 956790 (2026-07-05T12:31:54Z), 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/QZZ7X2566985.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf60cf1d47dbd5449c635c920d7086b7ec2d9aa995ae23c0a3d586e5c09084f22. Chain 2 (Bitcoin): anchored in block 957052 (2026-07-07T14:50:41Z), 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/TCADC1765088.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7f9d70c2276828919cb508fdfd475a51a4e39d2e8b4304c90d8a3e012e7feff. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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/TCADC1765086.
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