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 0x5f93e1db861112c89369aa640340fa4a50562f379dd53c2fa07e6169d400d731. 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/28e41a4a-133b-47a7-8922-d71b2bf882d3.json and https://artists.proofprofile.net/proofs/artist/28e41a4a-133b-47a7-8922-d71b2bf882d3.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 0x6391199f7193d72e933168bc38d70f9d80fa7143adc43dbee0c179ead25b3ab6. 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/FR96X1982608.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58d8b93516e8a2fadb53db5a6d968d7c85cf51ccb0ed135db277a88374532268. Chain 2 (Bitcoin): anchored in block 958152 (2026-07-15T12:00:27Z), 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/FR2X42045688.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x931d6e6de7ec180649881660217abfe0737b10f154dd6baa68245cb6488ac839. Chain 2 (Bitcoin): anchored in block 957851 (2026-07-13T11:26:33Z), 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/FR2X42045689.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xceb8ce247b6ef852257b03abc806e00869b53c6c2c5a908875bc21784ec91236. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/FRX202055669.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x872bffb1f15ee570722e48ba99a06ea5d3a5655bad51cd2f2f43a66751de287a. Chain 2 (Bitcoin): anchored in block 958538 (2026-07-18T10:30:13Z), 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/UK6KW2200063.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad5c02e06026c981c7036d6c50aa14a75bad89e641042031eb1de764a172e927. Chain 2 (Bitcoin): anchored in block 958197 (2026-07-15T20:40:29Z), 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/QZTB62383877.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x165b87bf3478d9ac9d8d94ae4eece2a631278b2ff4f9fcc1df1436cacc269547. 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/QZWFS2313349.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad5c02e06026c981c7036d6c50aa14a75bad89e641042031eb1de764a172e927. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/QZTB62383877.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x165b87bf3478d9ac9d8d94ae4eece2a631278b2ff4f9fcc1df1436cacc269547. 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/QZWFS2313349.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x371c067e11308ef5ccb91b7e3d6cb874ee87df7190d7938ad9ab021a9f6f8610. 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/QZPEW2423600.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb39ac958eae129fc5afd46a20dbc50eb54d173f7904d1f1c396668120f7c641. Chain 2 (Bitcoin): anchored in block 958935 (2026-07-20T22:08:19Z), 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/QZPEW2444171.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff9dd7e50d63fa3e498b7e34cf921a44e330a64520b663fd8fdde9c9dc4b5c54. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZPEW2477211.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75c43b38bac48e54f4d4aec58e6295216ee6ae56ecab053a93e3bf5b2c702762. Chain 2 (Bitcoin): anchored in block 958324 (2026-07-16T21:05:52Z), 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/QZPEW2405487.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x371c067e11308ef5ccb91b7e3d6cb874ee87df7190d7938ad9ab021a9f6f8610. 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/QZPEW2423600.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff9dd7e50d63fa3e498b7e34cf921a44e330a64520b663fd8fdde9c9dc4b5c54. 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/QZPEW2477211.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2da05bb6392ba698709e7930aa74482b1b3e48ad7ae031889920f53ed0042752. Chain 2 (Bitcoin): anchored in block 958383 (2026-07-17T08:20:01Z), 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/TLVEM2464876.