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 0xef100a099c2f9cd7b9760d165ee67796efe6b1829d9e777b4b743ac8db8f6875. 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/c4ba7752-cd0c-4f20-a980-20b70b07b231.json and https://artists.proofprofile.net/proofs/artist/c4ba7752-cd0c-4f20-a980-20b70b07b231.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 0xe692440f760e9152bad0d64b5cc1099ee486c69e34018f0a4b401d7e14768f29. Chain 2 (Bitcoin): anchored in block 959071 (2026-07-21T22:56:27Z), 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/QZ4UU1801390.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda0a2de77d99e91f8f246d7277297e37299c873676944888201dafa17ae64b9d. 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/QZ4UU1801224.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02b2d71f723b7b6898929fe87bbac1ce44eca2449f4575d25e748dda7dde8010. Chain 2 (Bitcoin): anchored in block 959103 (2026-07-22T05:56:21Z), 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/QZ4UU1801218.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x575db64f352b5bba99d14788368c7d7fab61d6a03e221f8fba402b14eac858f9. Chain 2 (Bitcoin): anchored in block 958700 (2026-07-19T08:09:50Z), 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/EGJEA1801663.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42f6b0d467931c2ebc8cd2ab49faf05e0303d4059f6fbbffeb84e6d331992e64. Chain 2 (Bitcoin): anchored in block 958060 (2026-07-14T20:39:42Z), 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/QZ4UU1801945.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a81e5608fc00372f8c4cb5e4447e72005dec55c3e5ca9f8cc1688661cd890e7. Chain 2 (Bitcoin): anchored in block 958792 (2026-07-19T22:55:52Z), 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/QZ4UU1900615.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2f268c30362eeb10636b7ab4cdae07ffdfb64695e190d19845eba37ca03eb34. Chain 2 (Bitcoin): anchored in block 958063 (2026-07-14T21:07:34Z), 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/QZ4UU1900778.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd9af81fb80cacdfffdcda77b5285deac296c10223cb600f6a5e2a3f3db47b98. 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/FRX281987896.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6494506b4d289c9010ed4bc5a3993120cde36f0bb5ce6b1583375a23eeda4790. 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/FR2X42062539.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x946b74a448e3fbe648b16394b54145495d14fa1672b383786cb43bf858ec6c3c. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/FRX762144426.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2492440e5f6d54f9910b9b860c41e2bc5ffb4237915fc9234974ef9c7ab3d02. 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/FR10S2320035.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x209509bde360840b5021febe41a5c041fa972c19b8f97e0bb7d97e39bb3a0539. Chain 2 (Bitcoin): anchored in block 958111 (2026-07-15T06:58:20Z), 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/EGA1K2300085.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8f67d7c277356f0d95829505d2ddd84bcf4cd1b3b021da8165b5332c1812783. 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/FR10S2320033.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe276fbf0ba2b585d404a59a7206b6f96f818dc69f86fa5aa68b4ca4499e14371. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/DGA072372856.