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 0x4f800b13b379307c01f9235bdfaf666c6db8fe22b9851af5d14e01a0f9b86670. 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/fc2b63bd-705f-442f-9f44-75354236abd6.json and https://artists.proofprofile.net/proofs/artist/fc2b63bd-705f-442f-9f44-75354236abd6.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 0x3cc6650ec9ae52f012b7a9e891eacf021cc3c54d96ee0dc3f256b916d4a6bad3. 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/QZ5FN2494510.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3dd0d7c6dd6abcb857b947fed866b9e5b69b2eceadec2c339647124d598a7841. 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/QZWDD2490600.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd907cf25c635413bfce50b539281b95d58d8abf143589cda41b1c70c28c9324e. 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/QZWV32455132.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15bf7adb13b77e75a35a2fa00855bc4f0fbed9af0dc6ea92997946d87cf41734. 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/USLZJ2177946.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02de87aab1ff8396fb318b9db8b0ff8f710333d892d3ff6f04b8db1fbf544e4f. 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/USLZJ2177949.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6149e47ac0ff29d10b9ee734bdbad3f7d44663355fdec33048a77ad4b7b6a55. 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/USLZJ2177954.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30380ca2208302146ffd36a3cc4911cf731880b6afac970458edb3cb8e946de6. 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/USLZJ2177955.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x555b2de5b6013a9fe9de6c0bbd1f8da11da69f469a628c257dbbd33f8600e932. 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/USLZJ2177957.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53a60218b454d923627967667671d3ed204eccf6c409bea7360b0f51cfb21200. 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/USLZJ2177958.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x463d04f2ffeb8aba8a4e637bf81f915850509aa7787ef8ca8d3916e34884ce92. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/USLZJ2177959.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05b769556bed977c25549e0e99c9b4199c9b0e0a9b7a330d324e46e39a7e0509. 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/USLZJ2177961.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2936994ea2def02c54557b93984dfe4fd6572b9bb6c5e20a947e9b646bb69e9e. 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/USLZJ2177962.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1cb9c558eca7c130a9b82b3dfb26c7ffe4fc6caab265b40aa2fe2ddd8de5721d. 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/USLZJ2177964.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xddf1f5d8ca6dcf4d6d857d29727966244ad3e4473e5c4a8c96c4843558ac5bdb. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/USLZJ2177965.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa84ee66225160dc17b7ea6beaca5c1c599d2f46dd868b289ebfd4fe2b81403fe. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/USLZJ2177966.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd137a36d3d473900260e9d9a30260402e55ce22cbf5747d126c7aab0e9fd397b. 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/USLZJ2177968.