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 0x04d2f88d8426f8a1b38cb51c449716c46ce027451ec69182bb6dea770e0c9f1c. Chain 2 (Bitcoin): anchored in block 953408 (2026-06-12T19:28:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/eb9fd4d2-bf36-40bd-acee-0b6ba22d6b6c.json and https://artists.proofprofile.net/proofs/artist/eb9fd4d2-bf36-40bd-acee-0b6ba22d6b6c.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 0x3d86921faa6177bc4231aad4343dd8cc30ce4594417a876a5b7861b836035d65. Chain 2 (Bitcoin): anchored in block 957629 (2026-07-11T23:44:46Z), 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/CH7811713016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37ee3b08f592c24e294984ace84d0a9f1496793f589847d684a507fdd74ff24e. 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/CH7811709544.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb82eb1a32031e5222dfe83fc4998cae31ea5d0eb4d0f0e90bf122089c1a85450. Chain 2 (Bitcoin): anchored in block 957624 (2026-07-11T23:13:54Z), 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/CH7811709545.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0f77fe28f571e3cda01bb5b9d1a5bf6638b8d369bccacda505374cc6d9c6279. 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/CH7811709548.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa6521ea83da82159e47ca5763adeca3b3332faa2ac58fdf9a68bf3debb39e7b. Chain 2 (Bitcoin): anchored in block 958975 (2026-07-21T06:12:52Z), 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/CH7811709549.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7cfd48ab33a66e8dfb7c229f6a362a3f6dcf800d9276c944efb62bc422c1cc9b. 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/CH7811709550.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6fabde73450c4fa6b6138c808c62a47c4d2818aa6adb90ce7adf20995f4ca406. Chain 2 (Bitcoin): anchored in block 957851 (2026-07-13T11:26:33Z), 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/CH7811709552.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd05a000804e8ead7c5857ae5f6ff1c75d2b842f78d84858ebc0e9a1620bdc40. Chain 2 (Bitcoin): anchored in block 957613 (2026-07-11T21:37:58Z), 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/CH7811709553.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc40fe0c5bcb70fa5c134a21024fd87d5652c0192410ea2fb9d5fe33c4f36721a. 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/CH7811709556.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcdc9aa6af1c06b1ea798c47e242898d6525a9c734263412b482ea0045b4d6c2d. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/CH7811709557.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf4e6b0f00e7a3fdec75b675e98a99d41d40212c0d2158862da2c6c4d386fe5c. 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/CH7811709559.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28c854b596ba264834b611b19337f19b3d576ca70a0140acd7732ec44e674708. 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/CH7811709560.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc34d12edcbd576568e6f0b2ee1174e45189baefd52e78c7640b24123dc1f03c. 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/CH7811710701.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2e2e2a497c45b490b839743c1785d6de109b90d0303a2dcd281d756391e2895. Chain 2 (Bitcoin): anchored in block 958395 (2026-07-17T10:10:33Z), 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/CH7811816943.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac8eb276d075419675f174a6dff2b900e7b6801a7ffbfad444592f8668ca5d0e. Chain 2 (Bitcoin): anchored in block 958392 (2026-07-17T09:46:31Z), 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/CH7812039487.