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 0x0221755a2b94718ca3276e70b352f10443cde83c17e94b5e39c591a9cb15f676. 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/f94b11de-f23c-4c6d-b643-ff410c96a25d.json and https://artists.proofprofile.net/proofs/artist/f94b11de-f23c-4c6d-b643-ff410c96a25d.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 0xbba6360ec58a461af26d3653811c050fe6f7b586d4e6b70b8caf286e43e98e68. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/QZNWR2040990.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1008f7a9aed35829e853970fd6abeb7017f678097e1751413a0fd8e879f30c12. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T02:01:41Z), 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/QZES82171108.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1144b15a95437dd3fd2bf1a4ba033652c8bb0cb43b60f5ce0aa53950b2255d85. Chain 2 (Bitcoin): anchored in block 958901 (2026-07-20T15:07:00Z), 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/QZN882215333.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82dc0d864a422ab8f43855948ed4fbf3694755341862186573bc4b0d29b91243. Chain 2 (Bitcoin): anchored in block 956776 (2026-07-05T10:59:37Z), 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/QZN882222665.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7d1d02f1b3e002cfa1a89564089cc7ef2a756436f7875e19d461eda69b5777c. Chain 2 (Bitcoin): anchored in block 958234 (2026-07-16T03:46:09Z), 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/QZN882238803.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf83098cc6b75856cad738146d030507d44c0fc4d491d4f2ab8688ee170d9abcc. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZN882238804.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7874bedf91a59127fc56751403946843bc3b6ecffcc2dafa2fc35d7d3c2d141. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZN882238806.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff9e98c85a84acbc3fcd17507133d34f0a0a68c489f396936e8f80bd54408850. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QZN882238807.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24d56126d7e679b6a5b1de162835841045c3472f23d1e3f1c75398effd234367. Chain 2 (Bitcoin): anchored in block 959001 (2026-07-21T11:41:42Z), 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/UKZGC2203047.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa404c1baa1ae4c383b11b2351aa0469bbf3149f30f0ef34e63856761f3f25b05. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/UKZGC2302646.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3fb9c00ba78775a201c4f4ce59b37285acdf8f7617a0092736498abffdff7b0c. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/UKZGC2304268.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b6fdd0e761dc72f103f308726e8c0a419460c50a890a9236ce65cf2fb68f0db. Chain 2 (Bitcoin): anchored in block 958552 (2026-07-18T13:15:29Z), 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/UKZGC2304989.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe761e2637e9532ae38719dd83ffbcc757afb6c96445a5c868c53265c03adefd5. Chain 2 (Bitcoin): anchored in block 958447 (2026-07-17T19:47:19Z), 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/UKZGC2304983.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3bc4fdabff5778acbe2c327be652428f05479118c3094b2a161e04798a362781. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/UKZGC2304984.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b1730a38e402d78bee7b47e63ba965582569ad181bc8019266d5a9d521412e9. Chain 2 (Bitcoin): anchored in block 958662 (2026-07-19T04:43:15Z), 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/UKZGC2304985.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa49f090c0e86238976cab3444bc3531d95b3d334ca2fd0a3afc46ee69199ef8d. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/UKZGC2304986.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59635c07d2eb22f0e8ffc30fb7c4cf7d5f8a36404275a59940fd4ae44c1809b0. 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/UKZGC2304987.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c2dd514bda825231c42d5604c7a484e8388eaa9d7fe755dfca1ddab3afedea4. Chain 2 (Bitcoin): anchored in block 958538 (2026-07-18T10:30:13Z), 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/UKZGC2304988.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0e50db3d01818283d2079938446371d947a0871bbd2b630c9d09d08dfbc7dc8. 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/UKZGC2304990.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x531ddaa672dc42303b9cd8edfefdd7af9ab6c4e57656c80f91833fb4f76448ec. Chain 2 (Bitcoin): anchored in block 958341 (2026-07-17T01:08:10Z), 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/UKZGC2407900.