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 0x1647f38c229cb8321f1e0fcde1e9e3e65b2ebbd84ea561f2e35b9a5b23a613cf. 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/df384604-0658-463e-8e3f-5d7662862dda.json and https://artists.proofprofile.net/proofs/artist/df384604-0658-463e-8e3f-5d7662862dda.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 0xc99dfc2cb4ff9205b19911aadb03ca9c9d6bcdd6d98323caeb8237be6423214d. 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/QZHN72392424.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac6bcbb9b1e1d404241a256abfee05f54136a61095b3e2c35a536f53b31717c8. 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/QZK6F2307733.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f180d6598a30c92dffb77c39784afb9b613a500a7c7bae873bf53c7045f42bf. 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/QZMEQ2364798.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa52cffbff5caa90b4e4a695a8f9bf6952cd49e095ef872d3ffa67a768b59885b. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/QZNWQ2302608.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd5399e6b5c75bdd078829794e13f6d6bc63866b81524968cd98155a4c16ff44. 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/QZNWS2316404.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x340fe8f7bf455058d3b0e19853bde8b1d82813058891f9a44b0c60c9e84db779. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/QZTAS2334482.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ca9769469a9946169073c98922f1c91feeabff05e3972f34ce0f2583ca28170. 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/QZTAS2334483.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc4a0da8e78b2a8af8890f6a558de7728f709c69ac5d721bb39fce10d84d985d. 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/QZTAS2334484.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ab4f458aff1b27f94dc1da7b4886f3aee41bd557e3b628f1c18e836d205d29f. 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/QZTB62328098.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9defb6de8f3953fd878c6b96b5f27e8d8192055d713bfa650cf47f56d29d1b2f. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/QZHNC2480770.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a345383a535fe7b837bae122b31ae375b175fc895b3dcfd093effb06b327cb8. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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/QZK6G2499309.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x470d0351a80cc7e128904e3ad5e0deba339c5a5b8e236df2ee022f7cbe08cda1. 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/QZNWV2475274.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x132b918107c7670b3c6e7f446fd2d95d8ebd21fa503753594c99acc3d47c3e16. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/QZPLR2486482.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc01f7d1ea27e3b378f685324d7696db419a67efd15f7021739c6c564651dba9d. Chain 2 (Bitcoin): anchored in block 958969 (2026-07-21T04:58:13Z), 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/QZWFN2428832.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19203771f981abad85d338c444106644b605c8b5ca2ba0564da3f0efbb0451da. 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/QZDA72565363.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x466811e3c46ad551b758d1d2e57a1cf67fc94cb87d4d51c001b437893641a5be. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/QZHN62543380.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf51fa5b543f371e06d88fd61836052a73d2a350716932b195a1fda5e7d8a1e4d. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/QZK6K2545084.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x532fd867d5ef1c49d4b8db4aaefe0a641d1e8be10c482d6f7ecd53b63bbed337. 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/QZHN52494626.