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 0xd816f0baba69fb21e344e3939b0dcdc0cf8e814efab54cd28d320498adffed94. Chain 2 (Bitcoin): anchored in block 953645 (2026-06-14T14:31:42Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/3df52730-4313-47a9-823f-e04e11282488.json and https://artists.proofprofile.net/proofs/artist/3df52730-4313-47a9-823f-e04e11282488.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 0x0b30884b919fcd30392f2d9b07cad0b9ec8a3b2f0b461d516f459535a38cb532. Chain 2 (Bitcoin): anchored in block 958517 (2026-07-18T07:54:29Z), 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/DEF069905800.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14eb0f61d80056b5b8e00a922759524ea9f4cc51bf204e6b45dcce3c156a35b7. Chain 2 (Bitcoin): anchored in block 958371 (2026-07-17T08:31:35Z), 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/DEF069905810.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x425bff9bcc9f2731c77b2e46ef2b30808f593d2f96abc727517a8add800ccb44. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/DEF069905820.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02a6fb3d170f4718e14fab4c1dfa519e7ef2be6d8af2e08b5a5f7fe7b6519fd1. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T10:20:17Z), 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/DEF069905830.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba5798f18e2052c768a0c363c180c975a0b33307788320b9962a61af37e28308. Chain 2 (Bitcoin): anchored in block 958805 (2026-07-20T02:22:58Z), 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/DEF069905850.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe81347e244071706661b80f024a5fed44a8b6e4267152155b8a64b81dedcc916. Chain 2 (Bitcoin): anchored in block 957766 (2026-07-12T22:25:04Z), 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/DEF069905860.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3bfd1a148859aa76b3bae73b73a8b4b36fe672d8beceb3396faa7eae1b1f7df. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/DEF069905870.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaca636ee8a73202bb7291b82511410918ed0b4222ce2111b5f3761f0b20bb706. Chain 2 (Bitcoin): anchored in block 958746 (2026-07-19T18:11:49Z), 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/DEF069905880.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb010df71163c180cd224a6c7d8a7e505b9e96982f082f4a45ccd6609f754ced0. Chain 2 (Bitcoin): anchored in block 958825 (2026-07-20T07:48:27Z), 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/DEF069905890.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2b7a734083fb5983362bc035834665c165fcb02a7f444758a855263a3789cd2. 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/DEF069905900.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91180dd48f4339d98002700d09b88d57790a268836a8ed365ac68d1c411fcc71. Chain 2 (Bitcoin): anchored in block 958234 (2026-07-16T03:46:09Z), 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/DEF069905910.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b6c746621c8e2d38ff1d1e60155bea3759bfacc826df440e7aead6f06961bb8. Chain 2 (Bitcoin): anchored in block 958800 (2026-07-20T00:52:19Z), 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/DEF069905920.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b01b8eab12ab250eb6d1f1764a4d9cb6674e84d5cc3d57f4b9c32112a0dba90. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/DEF069905930.