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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9c9b5ea5da0f8e40b45b2e0870098e56d069e47d778b522db031640dbc545db. Chain 2 (Bitcoin): anchored in block 953408 (2026-06-12T19:28:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/6cdf8560-334b-4cf5-a85e-88e5f54ea71c.json and https://artists.proofprofile.net/proofs/artist/6cdf8560-334b-4cf5-a85e-88e5f54ea71c.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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b83cf1c491724c26fed646d1ee1079e4ab37789a305a95ad418b2ab3eef7ff7. Chain 2 (Bitcoin): anchored in block 956790 (2026-07-05T12:31:54Z), 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/TCAIJ2429021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9817c3f54cc895e90c819b49b88a1345d09ec0ebd13a20640601ad9872c4edc4. Chain 2 (Bitcoin): anchored in block 958823 (2026-07-20T07:03:25Z), 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/QT3EX2414040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1483cca881a614fc8f257e099c8a28c4d7c0b7f300de264eaab4960408e439f. Chain 2 (Bitcoin): anchored in block 958817 (2026-07-20T03:52:09Z), 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/QZFYY2535685.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7bc840b0807ce31a4eb6b70f16fe28d0e6c053310081f52840741ba84554ae83. Chain 2 (Bitcoin): anchored in block 958621 (2026-07-18T22:59:44Z), 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/QZFYZ2579348.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d9a64c67a59405c823450c794e19af6055290e3544024aa2abfcf34860347e4. Chain 2 (Bitcoin): anchored in block 958901 (2026-07-20T18:01:14Z), 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/QZES52533497.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x755ea0d1dec7c20a105d6d119d3e1d8139d9b97ff724cd8ef95e7afa0b4a2ae6. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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/QZES82524842.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf740f4ee0c341f1153a5eba64cb239028ddeb56bd179b41f398f9595d5cbd3d. 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/QZPLS2575675.