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 0xca4efcaf9550845d5c3fd1c10dc641788e83ba102c54845b0ff3a2ed0a06fdda. 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/89c2741e-a46e-4485-9ac7-a49ddcd85ae7.json and https://artists.proofprofile.net/proofs/artist/89c2741e-a46e-4485-9ac7-a49ddcd85ae7.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 0x76ab35d23bccb15356a3d8207650ebd46fe33b63548759c7ca5380773bfe9744. 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/GX3Q92368325.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec6c21a08bf46a983822072008bad27e165e2cbe38daeaf571ac0ec1f0baa42a. Chain 2 (Bitcoin): anchored in block 960241 (2026-07-30T09:58:01Z), 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/GX3Q92336138.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3dbc0dca1d3d3fb114fb9f6d4cdad1c251f112bccc7606bb8364bf87eb576b9. Chain 2 (Bitcoin): anchored in block 960302 (2026-07-30T20:09:33Z), 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/GBLFP2243397.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70510a0261cf1296c443465e4f101dbb83185a4e273b46e202a8c50e0b835a1f. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/GX3Q92368326.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13623e94902d8c920b62574dd86895b8dd53bfa90eee4af66056f1752d3f0bcc. 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/GX53U2091177.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd10469aaa9059690aeab26b3b2d72b6ff96f92f39d9da5a1c7632621717d383f. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/UKXN22280802.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2bcf2ab41c9e60c96c9dd62f3c3d457158199576d3e22121af3b53d4f9e41e81. Chain 2 (Bitcoin): anchored in block 960370 (2026-07-31T08:38:45Z), 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/GX3Q92368328.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf540c00dfb22f84f6f0bb33968221a78d75d052224e62ff6871b484346304d56. 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/QMDA62307590.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc90af4cbca04405d2794c664a735fcbe8700eb93db4cdf6526d7aca080c7c2fd. 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/QMDA62307597.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c447314ddcb185e9281320502e77ae31960a7599ff5af29948d2a6ba47d4cb1. 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/QMDA62307645.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf540c00dfb22f84f6f0bb33968221a78d75d052224e62ff6871b484346304d56. 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/QMDA62307590.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6569570ba17dee96d58426db009bcc518bd554e2861eed5d2f2d84f282679fa. Chain 2 (Bitcoin): anchored in block 960314 (2026-07-30T21:00:46Z), 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/UKXN22236150.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3dbc0dca1d3d3fb114fb9f6d4cdad1c251f112bccc7606bb8364bf87eb576b9. Chain 2 (Bitcoin): anchored in block 960410 (2026-07-31T13:50:38Z), 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/GBLFP2243397.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b363b51eafc7509e81032445c2487ea5f6c89f5c909b7123defac527f6b4adb. 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/DEGC62002361.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda380e953a593662938d1ad014e6c16221721c14e46bdb569fd16b3db1f234fc. 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/DEGC62002360.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b363b51eafc7509e81032445c2487ea5f6c89f5c909b7123defac527f6b4adb. 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/DEGC62002361.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76ab35d23bccb15356a3d8207650ebd46fe33b63548759c7ca5380773bfe9744. 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/GX3Q92368325.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c447314ddcb185e9281320502e77ae31960a7599ff5af29948d2a6ba47d4cb1. 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/QMDA62307645.