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 0x8aae61a1567f3f93f932deb3f41d85325d6b84fab56f56a80e6e31ff682690f5. Chain 2 (Bitcoin): anchored in block 954693 (2026-06-21T11:50:32Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e9c18128-f449-47a0-b0be-6e1a1d74ac9b.json and https://artists.proofprofile.net/proofs/artist/e9c18128-f449-47a0-b0be-6e1a1d74ac9b.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 0x5924910743b5cfef4e2d5ba9c2e00500fce4dd4d9dbc63ae716b1322786822f1. Chain 2 (Bitcoin): anchored in block 958163 (2026-07-15T14:38:07Z), 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/ITM2J2510371.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9a9f1bec285b5754e544807e08dd55e6020185456c351a181b94a78cb9ca567. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/ITM2J2510494.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76ec983ef18aca21325777c2847b0e528a08294ed90c7c124ab1b6b412ebac72. 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/ITM2J2510504.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12b93469aa655aeff2534c4c466bc0523f4cef44ea4b055e509edcafa78a4aae. Chain 2 (Bitcoin): anchored in block 956775 (2026-07-05T10:41:06Z), 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/ITM2J2510427.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f5b5f3edeef16098ca64467289960fa3f2e4f3af43277d1649a677806866177. Chain 2 (Bitcoin): anchored in block 958911 (2026-07-20T16:46:31Z), 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/ITM2J2510428.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78ad69f355cbb615094cbc0d1331a548cb07494e1d3202ff653c6dc140ca7665. Chain 2 (Bitcoin): anchored in block 958802 (2026-07-20T01:04:02Z), 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/ITM2J2510429.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x675f8ffb7f023dd99380f601555c86aad752faf6cc4b590e355b692719b86f71. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/ITM2J2510430.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6872a3360b0dcee00ab881f2545229536468aa7c764fc3ab134f66f795c833c5. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/ITM2J2510431.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe75e0935c5244745b2fc25269baaf1230379060ecf6ba0e9e588ecc1e5c31c9d. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/ITM2J2510432.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe254317c0c5af9018dc87100d4c397856e92ec2138ca63f2a7aa01223679716b. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/ITM2J2510433.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd1f3576fd61a1d4be064329496a12790d1592707fcc790c805e3dd9bc033a91. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/ITM2J2510434.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b3ad3d3af3e4147cffb5fff70c20ce06d8b7f593adf2f76900afe5ad0798a85. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/ITM2J2510436.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x932d1c6b5e10d4378b1531f00f8cf2a160857ed5621a6466c89fae9b897350cf. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/ITM2J2510437.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x377229f3809c4f76288252d24c3196eb3c6cb7c97fd1d8bff470f286ae5ba577. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/ITM2J2510438.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e443bde276eb520fbf1d3633b73fbdf06afbeeeae7e2829c411e5263ac2da48. Chain 2 (Bitcoin): anchored in block 959118 (2026-07-22T10:01:58Z), 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/ITM2J2510439.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xedf2528f3917d6bce30feb5e94e90da1eca4eb1069574d8aac1e33a5bf48417c. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T02:05:55Z), 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/ITM2J2510440.