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 0xa70e0e46bdbfb0335a99fc6736e5fde6e0bb76a51813b72a536d48ca59f0664c. 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/360397b3-b8bb-4013-84fa-f588134e6006.json and https://artists.proofprofile.net/proofs/artist/360397b3-b8bb-4013-84fa-f588134e6006.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 0x898de14f3021f66533b694f9d35dc287dea9d223d53f5b933653c70be34750ab. Chain 2 (Bitcoin): anchored in block 958547 (2026-07-18T12:44:05Z), 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/QZHNB2453172.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72877a753e024f9e95daa06dc2d7481f55112cd7715b1768ea7b32e42e3a8de4. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/IDA941900216.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5aa721e1e817795c9988c67eea73bff7e02e8ef65454dbc093326d8d1d2deba1. 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/FRX872178766.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf313998714f2b51d7fdf4f12030f986dca27d65ab656862330c62138eb27670e. Chain 2 (Bitcoin): anchored in block 958058 (2026-07-14T20:20:34Z), 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/QZHNC2423754.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf49f7b91e022afb7518e93b266781667972c222733a1016ba6d4654ab6922498. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QZHNC2424481.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7adb1d184ec8483c0abab0ff50ef07dac95ef1376087540448db8e51d5dc263c. Chain 2 (Bitcoin): anchored in block 958959 (2026-07-21T03:51:22Z), 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/QZHNC2425454.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7f6acc48b9a216577e6335600665220c0ebf83f4e4bc2c13ccb7e131389dd69. 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/QZHNC2425457.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x588f9539671b3ee8736f1220e25a727131f56a571ec5ec19c7b840a60c995226. 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/QZHNC2424484.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13b7afbe42c4ee67e579ea389187f37425f2139471125aa29eda41ad55f021f7. Chain 2 (Bitcoin): anchored in block 959063 (2026-07-21T21:45:32Z), 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/QZHNC2425455.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4800ec9ae45a186f6862d361cf40e03b5fb1a6b21c3f5b902cb2bb7ca4018ca6. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QZZ7L2556764.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0aa5a09234e0849079051a616acdfb49b9796f14628b89e689f120d0ab17510. 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/IDA142306977.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a8b235a109ef9bb0f7a5fdea494b19173747c5c09ff233bc61ae0d1e1ae24c0. 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/IDA142306987.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec591fe69b398b4f8dbf1898f0a5514fb33915baa455bc93c940c5f71a1b703e. 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/IDA142306996.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5874f81b358e0cc7d4ef56e22dd5b4201d9e2e76fc5d473ab905480fb6025528. 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/FR59R1839141.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f82c20ed48d74aad27bead4515d73c4df2d934358bbd67bed9691c9a952529c. 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/IDA141401716.