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 0x48d19fb6c2821ee72709a0b962097119b5fd9b044d0590b4fdf7ecb7b71764c3. 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/8b91f82f-6dfa-4226-afaf-223ef4c3c9eb.json and https://artists.proofprofile.net/proofs/artist/8b91f82f-6dfa-4226-afaf-223ef4c3c9eb.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 0x7f17e2396b61c1f9b25d2e06cab4d2cdfd7ac9017553c7fcf16d2be7bcf45426. 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/US3DF2203271.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68928954dde43ec7a640ce0a06af1ca25506b9ccc25308cbd8643f49a47d34e1. 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/USANG2437171.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeccde49ce2442605db4db929388e112ccea29d47a391b441742e397993ca6cd6. 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/USANG2463258.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0386418e7ab1d9acc861d5a77498093c598ffbd8d88a10d84eefce8d865816a8. 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/US3DF2503396.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa438eea107f08605c99f82edaa3efeb728081f78bec22ef75d59f321c600c273. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/US3DF2523174.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6466d52105945e5bc3b337f2fed502e2db6209611e2b5db347ff165cfe1aa2c9. Chain 2 (Bitcoin): anchored in block 959107 (2026-07-22T07:19:23Z), 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/US3DF2552276.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x214f469d828c6c999141d762976dd14f2afc9567354eea5b4198182a54addd16. 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/US3DF2552278.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88ad8978d7e3e5b8afc21a8c3a1740fafcef36a5a1bb80e2eb9d5f2223018429. 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/US3DF2552281.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa438eea107f08605c99f82edaa3efeb728081f78bec22ef75d59f321c600c273. 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/US3DF2523174.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0386418e7ab1d9acc861d5a77498093c598ffbd8d88a10d84eefce8d865816a8. 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/US3DF2503396.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x256c1cc27f3f3f83aac2253914e37ed64092f13eb1ffc25c8445fe4ea303cef0. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T15:01:43Z), 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/US3DF2584013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91a6c291d2b390ee8cebed6f0c102ad3ab4d475d779474b4dd6a42b3debc0dc1. Chain 2 (Bitcoin): anchored in block 959155 (2026-07-22T19:22:30Z), 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/US3DF2584014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0536e23b8353466aaf28fbc678cb80f2dca6c1e8346b25880e12d4dfbb7be8d6. Chain 2 (Bitcoin): anchored in block 959118 (2026-07-22T10:01:58Z), 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/US3DF2584018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x256c1cc27f3f3f83aac2253914e37ed64092f13eb1ffc25c8445fe4ea303cef0. Chain 2 (Bitcoin): anchored in block 959091 (2026-07-22T02:33:54Z), 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/US3DF2584013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d0823c9b4da672c902e74b30151a6f55861da9ebf10dde8bbe69b8e4d004ed9. Chain 2 (Bitcoin): anchored in block 957788 (2026-07-13T02:37:37Z), 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/USANG2529570.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8fe73577a91686da5410479c0d35f7fdeb6eea35e4486216661b79adbad2a83. Chain 2 (Bitcoin): anchored in block 958876 (2026-07-20T12:15:48Z), 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/USANG2534628.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ea42dae9dcbef88e9ccb06306b2b94f8bea91eaf40b589f97ec5b327c081a8d. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/US3DF2439650.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72ec88a1d4b55d14349b046d8663936695f7b6c4aaf3a26c1320c1e865e0465f. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/USANG2449716.