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 0x622c17f41f706872ca8849899b473c3eafcce326aec2ffe1ffd9cc24d0ac0659. Chain 2 (Bitcoin): anchored in block 953817 (2026-06-15T18:10:31Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/fe0b8b62-64c0-45d0-8200-1cefb3c65cd3.json and https://artists.proofprofile.net/proofs/artist/fe0b8b62-64c0-45d0-8200-1cefb3c65cd3.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 0x283add663fda69d7806c4e43fe9c1b325b04792a4d3a6aea7a10413b34dba4d2. Chain 2 (Bitcoin): anchored in block 958908 (2026-07-20T16:28:12Z), 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/QZNWX2599957.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1cb3ee3e2dabd802f8bcc5ac245f168906e62c86d9deafbac0ee7dd9f8b2d3e. Chain 2 (Bitcoin): anchored in block 958796 (2026-07-20T00:01:46Z), 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/QZNWX2599958.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d09818ef0fa0111f01521195ba614a1cbd66f2e8592af332f52f62f7114ad83. Chain 2 (Bitcoin): anchored in block 958808 (2026-07-20T02:49:15Z), 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/QZNWX2599959.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0dbc1f33167aa9d5ee9f29438bf0bd061baa4127c1931a6c18248b0d6269b03. Chain 2 (Bitcoin): anchored in block 958943 (2026-07-21T00:27:37Z), 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/QZNWX2599960.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56f4bbdd0c746fa488f9016bb038ceaa9b5af9a5b3835ad724bbeb124f07282d. 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/QZNWX2599961.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeaf6f2fd53da2b6cb953387a3b5ed4a7738fc767a6c135a6236600447a7f6929. Chain 2 (Bitcoin): anchored in block 958838 (2026-07-20T07:01:21Z), 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/QZNWX2599962.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91195cef858ae2919a8167d0049656ea25fa1842a5b5b4f61934f3a1b7113850. 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/QZNWX2599963.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3f629711c875c0b95cbebe81d02e13d7abfa4683ab78de1d7ec84d3d3e85e10. 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/QZNWX2599964.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58d08507be6ecca3bef9016e5d1f691ca533d44081faa3f0cce441f5cc5f753b. Chain 2 (Bitcoin): anchored in block 958857 (2026-07-20T09:45:25Z), 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/QZNWX2599965.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae604922645c1ed1c25281f7e87fbe85146e61c46254c62325c8c9afbde56932. Chain 2 (Bitcoin): anchored in block 958800 (2026-07-20T00:52:19Z), 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/QZNWX2599966.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae13a908c0effbd071afa675175a7b1a18ce8fc2e415fae5d328ef8d3b2c1ada. 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/QZNWX2599967.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc15cd6f476d6398b8afbe9a513028fb587d1e348e4ac2791e3761735dd285631. 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/QZNWX2599968.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51ba4cdfbfd20df42ce9457b55cc1e91757abfa22dbca94501a6f5a3bda86ab0. Chain 2 (Bitcoin): anchored in block 958853 (2026-07-20T09:11:53Z), 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/QZNWX2599969.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42540c45566dc0aa0873ef9adbd75a7b2f361b97f7edbee50ea91e35a3d36075. 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/QZNWX2599970.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a29df94e6d556c28a28354ce4986b2bcfe511dd53949410d09b5ca00f0c3e93. Chain 2 (Bitcoin): anchored in block 958924 (2026-07-20T18:54:07Z), 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/QZNWX2599971.