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 0x454a23f8b4aac6e58c3f5765646938413fef0038c3974a78354a85ce399aed18. Chain 2 (Bitcoin): anchored in block 953694 (2026-06-14T21:38:09Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/6dcaa6cf-f4f9-45be-b8ab-cc6460e40dab.json and https://artists.proofprofile.net/proofs/artist/6dcaa6cf-f4f9-45be-b8ab-cc6460e40dab.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 0x4dff326dbf87e35cd06ed754432dfa4026e2cf33fbfd8bae8e189478df1b29d5. 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/GBTFP0700001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2f38601684145b4795b3911bf05a40f0ee57671891db88cc82c66c8da546d2b. 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/GBTFP0700002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef4cbd021f0f3e726d0d3853bb57dc64e857ec2904db64c0a50dcbfe1ace7761. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/GBTFP0700003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40694170479fa907a8d2323438b662e78fe3b0fd98993011cfd53067aa5f527f. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/GBTFP0700005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6474b0dbe471fdd0f37e6f285d63b020d71c69f67bb45645440c18eb4f2637d0. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/GBTFP0700006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc8191ff387c83f0be41b0bd149ca7bbfc359389bfbf2a0e64eef7fae6bec211. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/GBTFP0700007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea87b9c9efd6a7716f4d933ee6342c31e656473335ea6db531e47b3de6eccdf2. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/GBTFP0700008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27b657d15b5e4300e94a301d061110697e68be710d5b6ec0d8e961be229dbc8a. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/GBTFP0700010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1a398d485cda67145694fa35c836aac6c58dce86792c0005b220d57d504ac8f. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/GBTFP0700011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb276753712c01c582be97c5aa1e02f4ec77603d8d0fe0aedf0907dd46f8c6b4c. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/GBTFP0700012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfdac81d48de03b3a7aee9c5c78164850e05696a4635011f8e7a90c2c7bd80119. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/GBTFP0700013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36c5e5c01dc7fde378f9f8c87732bee774852a0cc2016c2d173bbeddbe69eb5d. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/USHM81439105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19a021fd9ae3f1e4f32ec2490dca25fc742ccc65f774ece835245331b832620a. 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/USHM81439106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x419d734040a0554de10e3bd0221af58452f1c4bf7e2a48664eb87d2284005ad8. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/USHM81439107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc1d5d0ae5ccd537b56eb4977bc22f4fa737c803ea64a9f9068c6cf0a25ae320. 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/USHM81439109.