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 0x71ac5b6129fb655a460f93d16a759e6b2a91c004a3a9de3f08c84d30f3bf0e36. 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/6a2fe481-2acb-48f8-b030-62a61ce45fcd.json and https://artists.proofprofile.net/proofs/artist/6a2fe481-2acb-48f8-b030-62a61ce45fcd.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 0xf85597cb09927641db52efef39c2d8ad53e3df2eee1d193cf32c4aa1ad11ce47. 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/QZHNA2433663.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4af2c4c76b38f5ece190b726f69dd95fe2e62a2ab45457b42a3745d96976556d. Chain 2 (Bitcoin): anchored in block 960337 (2026-07-31T02:51:48Z), 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/QZNWW2431277.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8fc91188904b8cd4a48bb1460cfbafa19ccfc0639b0b3bc8e905617604ecca2b. Chain 2 (Bitcoin): anchored in block 960376 (2026-07-31T09:09:19Z), 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/QZWFF2337571.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b7430de3e5b744c18a7324366f1ebf676781f1122974a3a7d267dd22a13ada5. 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/QZK6H2376689.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xecf8c46f7aa4127b97b358dd0d3cc9dcb7ea479a43d59b6700aead05c45acf18. 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/QZTAZ2213515.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b7137eeb1ab95f9424a7f5e1449ffd7fc29059dc702d407894ac72e66678aaa. 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/QZTAZ2213516.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88a6ed412f783fcbdf1be74128be657f48936d16dd2bfe7d8e89ea87bb6d3927. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/QZTAZ2213518.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8be1fec1fdb1a4c29c1d9a12da1736e03432b64adb38cdedf9a2c6e6f1a14e1. 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/QZTAZ2213520.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x739958589c8dec5d94d352f37ff78cd121e8a67cc292c1c49721c67e3ce6362d. 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/QZTAZ2213521.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0bcd721f97e32f10c1ace2aa1b5f9a327510e4962bb9af49661c4518c88e549a. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/QZTAZ2213524.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16d130c7c5e472a24ff21b2e01b1fd65e9e3a21ffb06a3dad4cbf288b16a905c. 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/QZTAZ2213525.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24fd9751535dbda960d4f583fec4a94252f0bc77f195a984f122f6856254d984. 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/QZTAZ2213527.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa60b60318df2efd0aa6c4ee453b0cd1d680b71c7188f9258325ee860747066e. 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/GX8LE2220986.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51235cf5bb254facb18bfed2898edf34c4490b5500e84cdd66609473e06d92d5. 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/GX8LE2217655.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb569f025f28b4c0e87202cb512a6f4a12fa3c7ec6da5a8a6ee3c0e1950f6afe. Chain 2 (Bitcoin): anchored in block 960177 (2026-07-30T00:21:01Z), 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/GX8LE2243224.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d95c2b89af572c5f8eebdc7b91803c79e2a7f5503b8fa291a15d9c0d0ab65ef. 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/GX8LE2239830.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5bf56c9e61d3b2b4aa83511761c15226954f1600539dc5b2dc62c593b2a6674b. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/GX8LE2242862.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc47716bdb3f5d12525c94d443b6a59b96a56240e0932f0fb3f1febf7077204b2. 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/GX8LE2270935.