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 0x628d7f42e36639f3761cff56c870552179b83d5499683921a888bb8ecdd561d1. 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/bfb293e6-111c-4a27-bbb4-77761fa2beef.json and https://artists.proofprofile.net/proofs/artist/bfb293e6-111c-4a27-bbb4-77761fa2beef.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 0xab9ab6a839e88e71b5977be728d2aff849a8f5f86cc296ab073443d3f71300ed. Chain 2 (Bitcoin): anchored in block 957583 (2026-07-11T15:53:17Z), 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/QZFZ52120730.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4fa30a74ce572985837dc830e7c8129658f9b5350ec360b7ae1de0efff25d4e. 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/QZTAS2191436.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d0dcc3c0ad1f1ea4e8ac7c52ae0c09d96d8e8a3cbcc51e82015810776fbf811. 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/FR96X2235648.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8554ea31f8510e1652d80b584644a7600a60bee6529a401c96d4a84e3db6f0b4. 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/DGA092374597.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2377f48372a69ee0f8192e83ae06c210c0865f19c1c77670de969318ee17257b. 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/DGA092374598.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa53f6a255a923507b44bf780a09fc927440ad8cde4c9a3f9dd9de6345bbf9737. Chain 2 (Bitcoin): anchored in block 958208 (2026-07-15T22:40:25Z), 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/FRX762301663.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x468cb09de4aa943b0844747f219ac7c8ddf76c596e4e68159c3130adf0e3f961. Chain 2 (Bitcoin): anchored in block 957895 (2026-07-13T18:41:29Z), 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/DGA092374601.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82e7b004ef71b797b70e0cd44f1eeed4baa7236f67882ba5fdfaa52f12fa5884. Chain 2 (Bitcoin): anchored in block 957895 (2026-07-13T18:41:29Z), 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/DGA092374602.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc31ef44b9fa931f0295fe55b5dff2e5d8f07b62f249c0b94a60168f62f59f0e7. Chain 2 (Bitcoin): anchored in block 958775 (2026-07-19T20:13:58Z), 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/DGA092374604.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa57c8b700a19d99b5a01eb8d3117892607b7562c17754567e2bd9101bdf640d. Chain 2 (Bitcoin): anchored in block 958335 (2026-07-16T22:37:47Z), 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/DGA092374605.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x323dd842d7dd928980498fb5263c1119f438650c4283a8bde8f57dd41a0f47b5. 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/DGA092374607.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7adfbe2ecad7ffbf822dc0a7a9c5577d00b4e02cfe4abef962044d35f870db06. 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/FR59R2468493.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc05d312f2029bd5991345c15f519bf2a8578beddb0862f176925a2ae19a37466. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/FRX282176269.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4269bbb1a0327aea0e0085c45cdd41d4676ade2e331255466907bbcb3dc44846. 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/FR2X42203274.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d34c154d40af350401966d9bc11b0b6c8486ceea4c6ac302f2d48b92a49a439. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/TCAFT2126786.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4269bbb1a0327aea0e0085c45cdd41d4676ade2e331255466907bbcb3dc44846. 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/FR2X42203274.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0afc150b4dfe0d908a47199ab83eedbb8d38fd6f14a6d17994dd9f69a1d8d4ca. 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/FR2X42290122.