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 0x8ccc8fb8e95b6245db219d60185299eb2d4ca0d3d5972417c1bc3885c38dcd01. 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/687479fc-4644-44ef-bbcc-f03f00806956.json and https://artists.proofprofile.net/proofs/artist/687479fc-4644-44ef-bbcc-f03f00806956.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 0x6f7c8aa71172fa0f744b55ef2276b9a44c046d1c2fcfc83654d3867c91981d73. 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/QZTB72257532.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8431af40301695a6f5b573537e140124d3fa99b0249f535807987af72117a1d6. 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/QZTB72257533.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf1393bd19fa4bd605f585db6142bd20b352edb161bbb49124cafd5154ff02f0. 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/QZTB72257534.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87f93f2b300e9cd1b47dab6006f8e622bb611df1818006a5bb4c5d59a2fcbc46. 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/QZTB92298770.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3472d8d27159935d4001183f1e2bbed53464deccb7670385fef97eb5ad0b930. Chain 2 (Bitcoin): anchored in block 958383 (2026-07-17T08:20:01Z), 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/QZTB92298771.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a1a8c476f019a06e7cc0b3b78272ae2051a09eb0877c4024ccac8c7d780669e. Chain 2 (Bitcoin): anchored in block 958897 (2026-07-20T14:57:46Z), 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/QZTB92298772.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x463ee859d8c98921540a1d4079aa183ce45b54c1d3ba52660c13ff1bc52bf6e8. Chain 2 (Bitcoin): anchored in block 958526 (2026-07-18T09:09:53Z), 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/QZTBA2232209.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x711ee4dd46a370dbb77f1310b296c91b9b7d639f3931115d029efa2c4de18da8. 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/QZTBA2232210.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c91e60f32dc7e7db66dca16674030cc032dfae893e8c84373c2c8d3fcc38e54. Chain 2 (Bitcoin): anchored in block 958742 (2026-07-19T14:09:34Z), 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/QZTBA2232211.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x433a626855354b3c834f88d3211b8c2014f6d89e125eb831fd59b19c19813941. 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/QZFYZ2306309.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86cf359168f3b73ed7365c2df23d35c0599fe18599de51ae70255b201b9d871c. Chain 2 (Bitcoin): anchored in block 958955 (2026-07-21T03:03:40Z), 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/QZFYZ2306310.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40beabeae814d3a75574e9329b93c293b32d7aa70765baea118d718d6056bc38. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/QZDA72389502.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe098402505f189ebbd9d3ff274c6e6e7c412c0f2bb2e57a24d09f8c1a0182799. Chain 2 (Bitcoin): anchored in block 958746 (2026-07-19T15:36:35Z), 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/QZES52347329.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9dc0e77bf712839093f8ce8dc00f4987c601ebbd8fce000854eb6b7e96c67c2c. 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/QZK6P2395567.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a02be5b2c8e8608e8992769c911068d1c07efdd8828ba9d15b72af611a261b1. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/QZNWU2370529.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb55c5577cab12109ad44779f45927dad3d02c8d339902581fadb02eef9dae1b. Chain 2 (Bitcoin): anchored in block 958650 (2026-07-19T03:36:41Z), 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/QZRP52344017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5428f4a975f08d827be0482b98498850ce870c1fe4c86c4fd2fe20df90756d93. 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/QZTB32336466.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a37df117d65489dc442694234a679d0b07a32b88624712699981632757b69c8. 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/QZK6J2481284.