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 0x0cc107a8db2978f0ddcf0223bb33e2dbd2096bb09af202b6821b629e48232bd0. 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/2615380d-2274-45e2-b726-7e84e8d2fbeb.json and https://artists.proofprofile.net/proofs/artist/2615380d-2274-45e2-b726-7e84e8d2fbeb.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 0x4d897df681b894e1bd98f4f4636e81c9af38ae925bab5fd4c565c132b2fcfb48. 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/QZA742309515.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c200e56d0a192c2b4126e2d8f28ea1e19c9c61b107997fde2d61cf3a80b19df. 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/NLF712406857.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe170a972a719927006f66d053ee6945146d3acae675b45a84491445ef55716be. 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/FR10S2400390.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7844b83ec36014e46cd22f69d359b03494f631d1888e1ff5224d01be2a86a244. 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/UKS3T2300022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5369707a18bb9695f1e51c3b1eb9774b0cb0e458705445e3302e9b0d2c1dd7af. 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/GBUR62000598.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4c606f8912915e32e27ab4c9967572ac52f2ace57cb0c0fd1b976b9ca34db57. 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/UKU332300147.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39ef42a751b5d7dd30bb8f2b2261958f01cd45bc0345d7f2080f8d5eddb5a0f8. 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/QZA742305699.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd5e739f5ad52f1c6cab4a45a6b84710f74d54e6ec860f141ae7249529c7b82b. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/GBJAJ2200796.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe0eccfc128fe98496426e7d55fa6f8f3540252a0f2d412d105ac7c23932e1ad. 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/GBSCL2200005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0a960b5d1724a4b5fb61c8d2dcfadc35af664f37b222dc692c2dd322d5fea5d. 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/GBJAJ2200007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf90d06fc742d14ddcbbad332ae4434254ed772a4325e1743e453f100710ba59e. 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/GBJAJ2101646.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4e4ea5c8d92b9d6ee5c1eef7d9a20be060d5f044c720a0c654fe993b4f71efa. 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/UKJSW2000030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d52b3dd76534212361564e694b1e933c075ac7ad0ff9853843516c68933f2f5. 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/QZA742306072.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e3f8a94a4d282112e699b774c02272aa4d9719af6ea391f8870859734e8b673. 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/QMDA72132588.
Toolroom Radio EP637 - Presented by Mark Knight
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Circus Recordings: A Year In The Life Of... 2021-2022
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7aa1d167680d23232391d35aa6af23275b749362db7304a6d94b4470bb9ef14. 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/GBSCL2200021.
Toolroom Radio EP618 - Presented by Mark Knight
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