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 0x1246751fbddf030fc6db49b3b83cd4edffd40202099ffd15827243c07e203c85. Chain 2 (Bitcoin): anchored in block 953625 (2026-06-14T11:37:06Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/2692bc39-efad-492b-8ad3-0ebef6519f15.json and https://artists.proofprofile.net/proofs/artist/2692bc39-efad-492b-8ad3-0ebef6519f15.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 0xeffdba3524a76f0812296833f1b062718e3df3767e5523e06740f346f6cf4cf7. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/QZN882265075.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9915cf4a6af528907d272127f44fb5cd8ed21885f61f4b203f370fdbdc8a49ed. 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/QZWDW2201557.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50c8a285870031240ba0d8e8ef73897a4d40d71889bdb23f52e2e09cd233afd1. 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/QM6N22345188.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58d834f68694256e9642eb468735da4f4b6ea53387deb3ef503e33a9abb9e036. 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/QM6MZ2494987.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf1939584ba4b2e04eeb04586975e5123d7c084231c6d1eaf6e92a1ef5c9a3b8. Chain 2 (Bitcoin): anchored in block 956776 (2026-07-05T10:59:37Z), 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/QMDA62428152.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd30e9c6953aa51d6d14f1728e9d5df368122ef7c26ba0adb8e2e7dd43394452c. 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/QMDA72480552.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8ce8cbf45ca1a1b1cfc26aa3bc316f52410c2dafaefd7803eb1cc2faefd3c19. 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/QMFME2476074.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd30e9c6953aa51d6d14f1728e9d5df368122ef7c26ba0adb8e2e7dd43394452c. 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/QMDA72480552.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12674fc1d414d5904cbbf25ecfac0cd0219f90b830df7006f54c29ee920a508d. 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/QMFME2476064.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c115e8cd411ca8d9431f905457257880010e438a72aa87239eba5eb8fa26835. 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/QMFME2476072.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf1939584ba4b2e04eeb04586975e5123d7c084231c6d1eaf6e92a1ef5c9a3b8. 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/QMDA62428152.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd30e9c6953aa51d6d14f1728e9d5df368122ef7c26ba0adb8e2e7dd43394452c. 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/QMDA72480552.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd87bba0476a6129c75fb0487fbebc5fc61619c1d7c80b6f5810e7c1bed5a9519. 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/QMBZ92592225.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1eb5597cbe79ca8ee64a503ebf91992f977d8ce0cb5c763b520b88aa8aba9952. 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/QMDA72577135.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb00ba80cd135060ac1e3ad91b8bc9c9b447ec89d69abf42da5e46bae98c7a99. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/QMFME2370401.