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 0xa873aefe6eb9d4f35880bc5dbfe9201b0e64e5ec60c3d886b3fa6b8f5af217f7. 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/4b4bb80b-4951-4f76-9f7d-38259c3dc2ad.json and https://artists.proofprofile.net/proofs/artist/4b4bb80b-4951-4f76-9f7d-38259c3dc2ad.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 0x74117a831147571a58a511c3abfee9c215e5c3bc332ee87446d2f823175aa23c. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/TCACO1607978.
Rumba Juankita (History of Colour Interpretation)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc8da64afd4c2d8645d7c43193c073cf33da19701cb7d7bfd79ae7847034014c. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/TCACO1607980.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd40f91e630bdbfe0bc492a1abf4b69a886349db8bbde194335a0fc48b0a05011. 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/TCACO1607983.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ec804c53777bc4792201706d9a7cb249f0748a9d8f41defa13715f4439a3621. 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/TCACO1607984.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e9798e5e04ef9d0d15da9a0b77a8f7ee1c5c200fd0bdccef37f545cc837f5b3. Chain 2 (Bitcoin): anchored in block 954130 (2026-06-17T19:07:14Z), 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/TCAET2052071.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96af41fe0731f6d6954200704cb901a4c78e1f08a05a3acf715140dae4f464f9. 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/TCAET2052090.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a995eb354ea15a2f38b111028d9a52f9b15d929376642ee16a00f4f5ef7861f. 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/TCAET2052098.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3807e4eafecca8d6ac2f6990a5e30e3e40c7d5e6de653a4c5fc64d846c2b83dc. 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/TCAET2052101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd750039a7844f94e91c14938e67755024a9f24cf1ae9975f0b8230c5cc07c7ef. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/TCAET2052106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d55446a8adab1eda22be84d15705a5e2f1c6524fb20efba85220438521a9de7. 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/TCAET2052109.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc236f7724a6d6b02327d9aec6e55ac4abebbe9accae5c5f5003818ac6903f958. 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/TCAET2052116.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd65c6131a0387db99b6cb2324faed6a68893824ed36ab3a1b097d94c1de73c25. 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/TCAET2052514.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb136a05194d7203b87c2984d0d8f22470a9b43d1508efefb28b32d8959f85d3a. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/TCACR1617165.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcbaa726ce55ff18883ff997da9073f4f99b428b2f3b8850c4331497caf2d6d5b. 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/USA2B2202707.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a679af9a9af35c9b58e8e73028cd3166df3bdb16f2c8db4b23251da389bb09a. 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/DEZ651710403.