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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6592e0c05de002ec6d2d6864aa26440eac6683bbdb20f4bf94a7a41157aa42e. 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/e70d17b5-bddd-4b70-8ca2-9d5e0d6baed5.json and https://artists.proofprofile.net/proofs/artist/e70d17b5-bddd-4b70-8ca2-9d5e0d6baed5.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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb26732f86ab42b31dfbae743194b27fed830acde10c9faae16beae924c7e0671. Chain 2 (Bitcoin): anchored in block 958955 (2026-07-21T05:15:09Z), 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/QZPLS2215029.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d8dfcbd3280185539f9056963917bb07f2199a73958661676f45779e58035f1. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/QZPLS2215034.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6f6c6fdbe29379d86e4526a6734e36b5c8bf49b72d186d398a5049a912fecc3. Chain 2 (Bitcoin): anchored in block 959024 (2026-07-21T17:11:06Z), 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/GXE9E2400044.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19ae3b713eedbf92c3250d474bb973d0db131e147d88f2641a931e3c3fbb0781. Chain 2 (Bitcoin): anchored in block 959001 (2026-07-21T13:46:48Z), 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/GXE9E2400045.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e2af502bf6d68de588ac31fea5a7cd3a6664840ade67075ba98ce3795c32796. Chain 2 (Bitcoin): anchored in block 959031 (2026-07-21T19:00:14Z), 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/GXE9E2400046.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a987a6596e3e83175e211e1a120bbe22b85730eb2bfe18ada72731b33b2e4dc. 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/GXE9E2400047.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5921e5e043cc65a495e2d5a0b715f6f249fcebd54f6838947b834f6f6f79603b. 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/UK6821634104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e360d6a3278ec146e88a093a487779a4ecfc3c8b5ba299da1cb082369aef8dc. Chain 2 (Bitcoin): anchored in block 960463 (2026-07-31T20:42:35Z), 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/GBKPL1945821.
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