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 0x0ecb3af66afa894df203e376a8492337d6074686e2d25648942aebb16b5595c0. 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/d7aad88e-38f4-4f9b-938a-2665a2c31171.json and https://artists.proofprofile.net/proofs/artist/d7aad88e-38f4-4f9b-938a-2665a2c31171.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 0xeeea085fd4ce2af40b595055f00ead3f8b80abe2ecf49a37577d399df4c42104. 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/BXNT61902035.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc03d7c13b90f4aa0eb2346ed2881c1a0847db3099b566f1161a2933445752855. Chain 2 (Bitcoin): anchored in block 958529 (2026-07-18T09:21:41Z), 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/BXNT61903252.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa777ffdd2ea3606ee9e82ee7c52b0ac10d72b42f736c3d301c13826b319562ed. Chain 2 (Bitcoin): anchored in block 958793 (2026-07-20T01:55:30Z), 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/BXUQA2300002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74a7b4d823fc1485baa78e05e05e5b2e40e4682f503f2b9dfc63a171ccf2575f. Chain 2 (Bitcoin): anchored in block 958864 (2026-07-20T13:08:56Z), 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/BXNT62400067.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa71aa672e3198e0c0de2a7641eb82a4e75c767a38edbbf612d73f41d149a48ae. Chain 2 (Bitcoin): anchored in block 958218 (2026-07-16T00:33:33Z), 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/BXNWO2400002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xacd30d0a8c0d6e07a53bdfa40fc6cbaec51683afb66d5c9e32bf86d74a02b217. Chain 2 (Bitcoin): anchored in block 959061 (2026-07-22T00:21:05Z), 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/BXNWO2400004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff1e015b5cbd994904832e3509f2d156eec8915f046b27892701468da8063dfc. 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/BXNT62401667.