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 0x5e1dd8360d756ec2e23b710ab0e209994cdfd85e40e2cac1c13fa92a39f64dd2. 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/6dcceef6-4e80-494c-be17-deb36f17b24e.json and https://artists.proofprofile.net/proofs/artist/6dcceef6-4e80-494c-be17-deb36f17b24e.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 0x6d21ac8e9afe180fe8bac54abe1fbf0ec3a7edf5d7dab8352201a41e0db2cd89. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/QT3F82505860.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5e6316c7cdc590207f4da2246342448c6d61e6ca46cdd6eafb9133e264da5be. 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/QT3F82505848.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac4e5ae6bae3dfa296722d500713758c227c2f37572bd9ebf8c1e5726fa93be7. 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/QT3F82501159.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95f753226dd255df9aab1d74a70f5899fa848b02fa1af77b9a190f70555a172b. 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/QT3F82505867.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d714624de567dcaa33b325b9e5a04a12088f24e4c8361e7c45117f6834d90cb. 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/QT3F82547794.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8486c49989f83eed47c4f693e371572ebf2ecafeb2aac3d8b9a64e479ffc7052. 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/QT3F82545525.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23ab543b3e491e4fa5e4a18c3ec31e670dd13e776dae15934816393dada869e8. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/QT3F82547790.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb87e1b04c8e2080b1d0993444fee499c780ca0444d2e6e881034b8d3843af7f. 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/QT3F82547793.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd483d0cc52d8ec4be1e79211b1ea105c4a1f08578da029807f6e33220bf9169. 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/QT3F82592950.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2cc61de5106d9f1328d67ec3bb7b1912b26020a75b75c7fb43df322fced5180d. Chain 2 (Bitcoin): anchored in block 958331 (2026-07-16T21:55:37Z), 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/QT3F82592949.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06e658baf28849250a52ba30fce47938279196ae160e8c143a543e150f2cfc2c. Chain 2 (Bitcoin): anchored in block 958342 (2026-07-17T01:09:53Z), 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/QT3F82591261.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe95ed4fdca650b5c3d603e959fc041d5d100125be0298007241568dbd7669172. Chain 2 (Bitcoin): anchored in block 958335 (2026-07-16T22:37:47Z), 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/QT3F82592952.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb37fd81734a20ea20f164a18830201fe6b90679e756971f4ef78fd7ad4c0017c. Chain 2 (Bitcoin): anchored in block 958342 (2026-07-17T01:09:53Z), 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/QT3F92545985.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3e9f81493d44bfdb9c9c222ad7637fc9b50f249a90c13ad42b0818cf055fdc8. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/QT3F92545986.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc951b281474d603bab11384e65010f7d6d914dcf69561985aec0e0383f82de88. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/QT3F92544419.