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 0xb3eb68bf4b8db9f1240c2ab0d3765ac2aaaedeb6abfb8af2c7879c581144bb3d. 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/58541bf2-e17c-414b-b147-98879f515452.json and https://artists.proofprofile.net/proofs/artist/58541bf2-e17c-414b-b147-98879f515452.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 0xe0a3d0f91afcd60149b1293247e28e6904f3ce7d78a2b3431f30844949824191. 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/NZAM02000515.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb48c1c7f587663bb7bdbb0cfc43bc0923012a2e16a4609175133b46e3ae20915. Chain 2 (Bitcoin): anchored in block 957052 (2026-07-07T14:50:41Z), 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/NZAM02000516.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ec5c983455addcf357a651df21d9ba11e93031f7310d6aefb4db565fd76fa41. 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/NZAM02000517.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44b6518aedb17a0a08d0973e6ce879f2a84361730437492d390ccc7bc18772e4. Chain 2 (Bitcoin): anchored in block 960259 (2026-07-30T12:51:24Z), 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/NZAM02000518.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80d48c6cc03416f7b4d13fea5d233c16e2842100c1e55dcef56df00dba174087. 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/QZK6Q1996129.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0bcd638e8b99b8c7c3920f0e4d0c614155d67d60893577c86036f10ffea2996e. 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/NZPB12302209.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xebfb33463d6c57c97fbeb797845216d518a393185a839249d5be3e07197d6b5a. Chain 2 (Bitcoin): anchored in block 960247 (2026-07-30T10:42:33Z), 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/QZDA62236976.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f713e7bb2515b4588cafdd5e9ac97fe03d3bcaedce20154afb9f059d2aec176. 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/QZDA62233274.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3a00c65c1c77257f284b68e0e7d5ebad428c23f4a58cd1a436bcca067aa813a. Chain 2 (Bitcoin): anchored in block 960125 (2026-07-29T15:38:18Z), 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/QZDA62234786.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc51b17cab2f7e65f14616b064d345482b7167c1f2880b744ee55e011d46377c. 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/NZPB12301233.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5572f255ef0909ddc75db03ad8e53d74e7189c4b3c89b90faff328b4671c6c33. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/QZDA42319526.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x944b6abe8719851f2b9d82d364cec25fe55d94ee1829cfadce7000fe2758ae39. 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/QZDA42321222.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12222f4a89d8df7ea3774e3960f930bb580bbef927c7285447e7af917bfcba75. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZDA42320584.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xddb9ea92ec6dd533fb6aa95b8c807c5487ee8957517877e6a8603910eda4599e. 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/QZDA62233272.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x932df075a249e7a66da9cc51a984b9913c0eee55af8d2e8c817962f8c8651510. 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/QZFZ42335318.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a6c09c204ec3c5040967d0f935d63ac95ee6ba019159e336e12e5b69f87b189. 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/QZFZ72224980.