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 0xed7f804ec962fe0059867621081d2ec9b3a313f9dbb5398acc4dcbfc8f9b6335. 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/d940314d-499f-45ea-a0ab-670a5164cd61.json and https://artists.proofprofile.net/proofs/artist/d940314d-499f-45ea-a0ab-670a5164cd61.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 0xee72e775131720c1cd3084be5db1246a3d300e20cf5aabbee2ae4d3db807c87b. 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/US7VG1919256.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a517d4b215cb34aa8a4cfe553b386837c6ee1b4efbb8aa56ccdf286a317777e. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/QZW9L2458785.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf92529d735a3525d4f3ad8c374c7ad866f854ebb2198dc4ccbd39a58a77aa74d. 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/TCAGD2296065.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2da46d5cd1fcd6d733eaf1f4652d314befbe0817345ad45f82ac7da0de9c2d0a. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/TCAGA2215740.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb119aa8320a375692029b5a72d09a80974591ec33b9c7143818f43845eb10ac2. 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/QZ5AB2132802.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1eccee24f0688dd74fbf10c6881338817055850fcf4877fe75307832e6286514. 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/TCAFD2091844.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb62bad451ae53844a8efc0ebc6b6a702e30b51c1ee2af5d0ad77f59d85223bc4. 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/TCAET2026527.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42a7e1f4c5ea337923bcca7d1e3b9e4990a532f64d4479f7e49cb6ca30fe3fae. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/TCAES2086491.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa5f9e18737aaca70adf714f69890bf031d900bc5336e5db48614c66e62a16ba. 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/QZHZ31998109.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b6034b88e6e1ef92f90a5703afc52364bdb9dfab863f100c566e1be3bdecece. Chain 2 (Bitcoin): anchored in block 960250 (2026-07-30T11:13:28Z), 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/QZHZ31970794.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91a352837e3623c348b9b35644188d7e23acf2b41141b043b064a1bf7bfbee6a. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/QZHZ31970806.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3178357d271632fb51252deb97ad7ae12319e92933142b9ee89d7e579bf5035. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/QZGLS1947211.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xafc1dd5fca823520887ea1c5b9d54e5fee870f60e90806592373f73d94502107. 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/QZNJW2511694.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04cf82a7e2f62da12bb89b50c430f37fc7341314f9f5c17cfa104809d4c5a6e5. Chain 2 (Bitcoin): anchored in block 960506 (2026-08-01T03:50:58Z), 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/QZMZ92595925.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e303965b14a23adf5c5f462bec21bb7d3e633505109a3dfb0c7e3da3e4d9b8a. 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/DEUM71704108.