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 0x315a8ad5c9f2ef3b55f96072b81763a7c2c02d4d7b8a9a8d959c064a173e879a. 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/644c0e04-a8d7-497d-b51c-c74613dbbf6a.json and https://artists.proofprofile.net/proofs/artist/644c0e04-a8d7-497d-b51c-c74613dbbf6a.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 0x84ea7b2c14bd47ff71d7062674147b33671a72fbd7a58735037c1aeca8b5849e. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/DGA0L2365303.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x724eb519c47efb2fa6bbefc1f2d06008302dbae48be3f767f3000eab5e823cb1. 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/FR59R2449794.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e83f1d625b86a328df3704cf6d27a553ebb8d0fbde178dcf948c5e82f8c422d. 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/DGA072424345.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe370553008811940053c8441e32df77ee835da4ce255b9e98bd33da46992d37c. 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/DGA0M2435285.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e8e056fcb5e4d8d9f2416d7676e152175ec3c7d8dcf53faf306413cbdf23f2b. 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/DGA0H2415624.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7b99d5def5d085b7e1231d078e20bf7a00bdee9006f0a6cbd098246143824ed. 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/DGA0H2491335.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf69b757e505943864bc77ea340da65c22315e321853d8a5866a333f881a7275f. Chain 2 (Bitcoin): anchored in block 959076 (2026-07-21T23:41:40Z), 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/DGA0P2408713.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec94c93c66899213b1e2c72ad885130a6144e2e7774b3d7da29c6e15abadb385. 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/DGA0P2485688.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c56f0fa93f49e5171b54124da5e8ea5685338db8dabbcbb4c55545bf757d343. 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/DGA0R2462939.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84667873a675e80b5ad42b0af796f84b7993e6c4d93b6d7e552b1de0162e5e99. Chain 2 (Bitcoin): anchored in block 958576 (2026-07-18T16:22:28Z), 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/FR10S2538818.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4f28a9811e7e77f381501678af3c801da1701feac827a2e9f72a925faa029b2. 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/FR10S2538819.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0bb6d08f76e4310873c31e2e10a897e50a8213e25caf7cbbf1316abd2c146fda. 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/FR2X42544652.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xccab25c04844bbb22aee53a7b55e52e2d25466f9b2bf0c56e8efadbb7c34beb4. 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/FR2X42553532.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x346104572eccc5ecf96fc7b9b4af8931fcd70975cb46330278520c85840cb1b6. 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/FR59R2576654.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc49a037d64002a040ceacbfa21d310a5da33c2226afe150bd734b5572108b710. 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/FRX202525403.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8bba6bfb73b47b93398aa7fefec668c39ae3590441ec1e41ae83cd1aaaecd6cd. Chain 2 (Bitcoin): anchored in block 957774 (2026-07-12T23:51:20Z), 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/FR96X2594685.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0dd35971727023f9dbd8dda2d4d2b2904ee316f387973f8eabffdd0c6326d89a. 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/RUAGV2510689.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9804e71e0aae43971c7be98dc47ccfc2fb36cdff0d1751dc718b965a652130b. Chain 2 (Bitcoin): anchored in block 956776 (2026-07-05T10:59:37Z), 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/RUAGV2512099.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda08a10f03c400578154a48512845c8a2fbc11ddff8ff01d4b80dfa529f7bf7e. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), 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/RUAGV2513901.