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 0xcd50ab6eb5ef33b8b0f0df21ea0c5fb8b969930f9e9014c67933deca78fae782. 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/1a6c0ac4-8aa7-40a2-818e-db20e73e5b72.json and https://artists.proofprofile.net/proofs/artist/1a6c0ac4-8aa7-40a2-818e-db20e73e5b72.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 0xd02624e686ad795e6065a3b49a9aa0992b3dba91395622aafb1dca9d60a636ef. Chain 2 (Bitcoin): anchored in block 960509 (2026-08-01T04:30:37Z), 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/CA5KR2472943.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9ec672d9c2bdd17a6cfdec2e95cb7b1f025b08eadc9eb793ef5588995717ec4. 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/CA5KR2472944.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7d5fecd0a5f3cd6194b3272fc8d8377aa25fddb7723a0f7ce681a707cc0429f. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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/DEH742418301.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8332c711c775659e98ead2ddcf4e69dbeab4381b7e6f2716cf54e0701af0bf6. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/DEH742418302.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67015e2b5d8534ba23cbfb9c008fd2b969eef49d5452e293ebb863e8a74098b2. 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/CA5KR2428245.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58e7ac51143d88580eeb4b3fa014a1858097c1a88e6e3e685080527efb03476d. 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/CA5KR2316748.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5037dfb21154127dca72f711fcbc79ea72bf8fa681fe930e5a675c14bfcba861. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/USNRS2443430.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbaafd95bb0acf9f207aa8c9343d45c4c8eeb15ebd66876c46cb2e18d1ba043a1. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/GBLV62317964.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14c5f5b77fb2382c1522a8fe7126ce369e7212e6b04d513e3d47816e33dc6c2d. 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/ITV262300126.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ee436245cd38dac54390e579065573fa5dc495b3c4dcae45ae159fe452a614e. 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/ITV262300127.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5f91d2105fe75d643f9a72d00c4d331c22ee582c328002b69c5b019f15c8860. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/ITV262300129.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4a681c1b1f920734dee45e992ae4563e8a86f3db9435f849d76eff7324f9250. 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/USNRS2342973.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4158ede944a737c2ef871d209696ca15355d3fac72abb72f089f7cd1f6bf15ed. 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/USNRS2342974.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41ef65bef5a054cac5017473a9ff6b72ae5e8a5ae7acd6092065479394c04bfb. Chain 2 (Bitcoin): anchored in block 960379 (2026-07-31T09:25:34Z), 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/GBKQU2336932.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a3340ac72de75a07b8c32c3792dd46c09ef16b890603a7f9b9fbb3b6e688c55. 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/BEE202300047.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8d418020eae6245eb9334150715872073a4fb5f52a93275f0176669e8260627. Chain 2 (Bitcoin): anchored in block 960222 (2026-07-30T07:48:45Z), 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/CA5KR2342594.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc2ce3fea31f9914e49f3ea4984dd3518312b3e181838ed7d7f289a1159572a8. Chain 2 (Bitcoin): anchored in block 960157 (2026-07-29T22:12:10Z), 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/CA5KR2342595.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0376e3a3f96f85d4cd42f082267baaba228a35b2c712f0744535f8876f44bab2. 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/CA5KR2325131.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb0d4fe62a1033e997d5faa0b38b0befbd7fc8948971032cc628d2baaf8d52eb. Chain 2 (Bitcoin): anchored in block 960288 (2026-07-30T17:41:38Z), 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/ES5702202417.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30738ba1e7a3003e8dcd68df23339d548589e4b604c091ac5a0b934a8979850a. 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/CA5KR2301045.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x157e7375a641d6d7cb36acd902c0b37263598ed75bbc6163d3b0b2e148fef778. Chain 2 (Bitcoin): anchored in block 960389 (2026-07-31T10:20:10Z), 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/GBKQU2257172.