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 0xa5d54e1edb26a9c6e5484b541795deff01af4ab124c58ed8472e3d267fc056df. 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/c5a0d819-9ff5-4abb-a61a-a2340fbb28aa.json and https://artists.proofprofile.net/proofs/artist/c5a0d819-9ff5-4abb-a61a-a2340fbb28aa.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 0x45d7f5d522869dee615e06a1db4187dcaf7db9c6aeefcd851e628c0b8c1df4e2. 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/QZWFF2350529.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d4e26c6f63f8d8b2cb67a2ac5af4ecb213af1da9f7a59828382a389a4f53a65. 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/QZWFG2322186.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21d581ae576031a736a515a4b71e80118f2622ac6be3d105564aef891bbed42f. 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/QZWFG2349237.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbdcf02eb376117200b1d87501f836ffdd9eaef0ea31c0512c1aa5667608912ba. 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/QZWFG2317639.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd36a4d969041795105e31e82a1ec65cfb3d569ecbe1723c16064522316e34b9b. 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/QZWFG2316276.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2d856516fd0e516d309fb4306f142d80ccf46a87621728cad00a31eaa73c92e. 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/QZWFG2316277.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9256d621f164d4beec7a1b42b6b921ffe41583af9111b6a88efdb4ead400cade. 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/QZWFG2316970.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfab4ec37306564d1de069dc7e8f32a9a90275b447fd7a742c34845ca9a72b491. 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/QZWFG2317640.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbbdd63878b5f24c68118df267887624f57a787bf1111b0d8dde72832b3f19d0f. Chain 2 (Bitcoin): anchored in block 958917 (2026-07-20T17:53:56Z), 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/QZTBF2340090.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71cf0fccf7d354165852aa01d0b340c08685fd98786b5d9671c27f31f8b38e88. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QZWFE2348039.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce7c3003fefefc77648f5ce019967d7a90b5e5c544ec5d56eaa8c713216b5061. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/QZWFH2332300.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b797365df91e567dc3ae9cce2d66553c33ee8bde9c17bf348dca0e2688054b8. 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/QZWFN2311953.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb68b81f91c4e4750cd376339ff4be04400bd9999e7189403c5cdb1584b5f477. 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/QZWFP2303408.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x201d3e4fa567f588d594bb4b67b919466964259d3fdb0caf6a39559df35beb0d. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QZFZ32452499.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a6445d4c6fb4a50574cd64e8b6e7e279ef1876afeae5fc6b99246309f8160ec. Chain 2 (Bitcoin): anchored in block 958792 (2026-07-19T22:55:52Z), 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/QZDA62444303.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8c696f8b695df4e8df0f0bf83d7c531f98f4f987e638d2f0c923c6ea9e4268c. Chain 2 (Bitcoin): anchored in block 958660 (2026-07-19T04:21:53Z), 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/QZDA72428390.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca9258d7f26d2022cbc8cffb59864e712ab22520efbca64883d7cf9d0c5da657. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/QZHNA2478324.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31267921f170c78e7565b176a0affb5eda4496706a59cd00c938795ffe8cee6f. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/QZK6Q2440834.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x779426a7159dc6561196a38720fe126609368465701159d51c044fc1e830e6c6. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QZK6H2440019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5001a45511700f6641dd4b4ef85009a3e2175be4b51bcd3778430d644c46dbdd. 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/QZZ8A2414118.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x505ed4d195dcff145028b8a090ddd1e36f8bd14c661961cd189ddb1e97fe372a. Chain 2 (Bitcoin): anchored in block 959065 (2026-07-22T00:42:13Z), 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/QZZ8A2414129.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b9192c9ca62a8a38c8502eeb9bae658b3b0c5430c22953caa4471f74b7c2313. Chain 2 (Bitcoin): anchored in block 959034 (2026-07-21T16:34:25Z), 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/USLZJ2545566.