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 0xb3ddc3884fa1f0e5d08f27f8dda7746f8b750a7639970ffd2ecef5ba42657a06. Chain 2 (Bitcoin): anchored in block 954615 (2026-06-20T22:44:50Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/c4c14809-028e-4400-bcdb-5ad9a761affe.json and https://artists.proofprofile.net/proofs/artist/c4c14809-028e-4400-bcdb-5ad9a761affe.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 0x1a73a2810c13e9a8feffda682c68018b6b68bda15f698c32d8c9adb04dd38740. 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/ITPNL2300127.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd94327549523cd8a2639deaccdb94f500b79f6be3293ec70b5daac57cea0a5e6. Chain 2 (Bitcoin): anchored in block 957020 (2026-07-07T09:18:01Z), 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/ITPNL2300133.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68fd21541cec5c35ce9f4e69cbb9400e685ed84060452b193ec92eddfe4f3661. Chain 2 (Bitcoin): anchored in block 960230 (2026-07-30T08:32:18Z), 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/ITPNL2300139.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdcb802c914a6320174abadbe5c0e3f46fc94fbfa7cceda2166b56c4f806a3b08. 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/ITPNL2300145.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46be14c2bf707cd1fa280382ce9ccf71bae69e905f4bf3d7fc87d65980973875. 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/TCACL1654280.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75cdc03820456db5c1cd04fc5c4891d2ab89236a6755193c8a9bc89b39cfdc91. 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/TCACL1654285.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd11636f6e313280c8c2a2d432e800a5b18ce3cbd6bc35ff691097f56f50fd905. 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/TCACL1654286.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb404e2e6dd0774ec821fdc35d097b05c0818f9fc4d73a02dfd2228a33dc4483c. 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/ITPNL2300167.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72c71d8ca3f6c398793152cef00f779f35dba1adffb385de72d42df4f8cd25b2. 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/ITPNL2300174.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00105145522a0dd3d9529107bb98e05aae06760970753620dcac065b5d2345c7. 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/ITPNL2300176.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3507ecab61ff9c2f73f9a4d7edcfa456e48639c64c606b9bfd24ae182dd017f9. 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/ITPNL2300180.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ad5f9972935262f65ac0927efb2ba15a033beb072b00b97464ca6e113f08093. Chain 2 (Bitcoin): anchored in block 956894 (2026-07-06T07:53:57Z), 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/ITYG92100065.