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 0x42b689351e65947b7a22db94fd7d0909aa3ca1c22465af06ee26eb089fc2f97f. 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/ffbfb7c8-2c0c-41c4-a884-739baa79580a.json and https://artists.proofprofile.net/proofs/artist/ffbfb7c8-2c0c-41c4-a884-739baa79580a.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 0x91d122d06797c84c5bdd986f614a61a54a2f545b31d7470c27beaf5b19e29e8e. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/TCACK1539323.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57295c716b4e3dc6b798a5eb1e03f2269959c68d040562e161adaf6600510b16. 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/TCADP1800316.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaede1c66b0bfc3414f05bc6c3e325f5a216cd6a86920e584e40f82672748f575. Chain 2 (Bitcoin): anchored in block 959001 (2026-07-21T11:41:42Z), 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/TCAEE1978474.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00da44646c2f1bf239c3ed1644948796c3b63d58b1462104ca94872c74e2d2de. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/TCAES2039019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe36fb3c55b6571e735209a48813a245e414c8832174f9fc8deef84a6c03e8b53. 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/QZHNA2045987.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c3cc859309d67c79703a99a8c322ae5e5fef6c04bc8e963792eddc7d6f895f5. 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/TCAEQ2026979.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c635aa67c834b7501b3dfa31e4d99538680a12bb7affe7a1c28a7fa84b37a63. 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/QZK6L2023905.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7fccd26aca9711dba9378a1f22047c61540451fef6f1540d1977a4208a4a090d. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/QZK6Q2008438.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1875487cfceafdc4e051dfa23ca123bd8f8b388bb00fd5e215479e92864dd987. 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/QZNWT2001305.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6147cf1b425730a68e87cc39afb9e48dafc369252c8e1b1c292e3841bf09cf70. 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/QZHN62146295.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6147cf1b425730a68e87cc39afb9e48dafc369252c8e1b1c292e3841bf09cf70. 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/QZHN62146295.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0cd261b0733b60b155557efb4a84c5fbcebd3ea906a88a7469d37ef9c389233d. 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/TCAEB1992152.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeed9e23b0e8fb9a4537ed6ef03cde7f5abccce5bae711f402f791de0b604e534. Chain 2 (Bitcoin): anchored in block 958363 (2026-07-17T04:34:46Z), 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/QZNWZ2223528.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d63b8676c5a72206eaa4ac509631142cf45a3d14f379c7d76ad6b0fbfd5b203. 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/QZDA82349074.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3bee7945fbdf530213ef5d2b23465604229cafa0bf91d05d5fda4099fe2b5481. Chain 2 (Bitcoin): anchored in block 958371 (2026-07-17T05:45:43Z), 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/QZK6P2481173.