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 0x9b426150ff624e4c5c95fa156ceeafce77238ceb1a5b1d18fc76ccced1b63c38. 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/b6a4e441-c17a-4466-b42d-45fc94ee0b57.json and https://artists.proofprofile.net/proofs/artist/b6a4e441-c17a-4466-b42d-45fc94ee0b57.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 0x68ed54cae24e454ec01052b2330f320a002e1b44ea654601c4639eb52a0eb1b7. Chain 2 (Bitcoin): anchored in block 958867 (2026-07-20T11:08:30Z), 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/QZDA62305191.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x189c19aed77e0898ab1221594bfc8472d320b973077401de9fabc4cf97d299dd. Chain 2 (Bitcoin): anchored in block 959069 (2026-07-21T22:32:59Z), 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/QZHN92319029.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90da58ea4422b7eb690f8452f0a0b9a16f56526b21d4fe657dc902139b1d7cad. Chain 2 (Bitcoin): anchored in block 958245 (2026-07-16T05:50:22Z), 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/QZMEN2394947.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2a099734f75cc9abe5f6e5f628f5d5edd151c37fa08e059f990316ef8a4091a. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/QZNWU2380075.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e6f7674f0acff895b4bfa92c37ffd9ee1c2cf823430cd8798bda04a6e5783b1. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/QZTBC2367029.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b0a28ca7f6f0a2e5ea7ae3c2c06d71aa7a3cf356a6f8e828dac1489cb6616f1. Chain 2 (Bitcoin): anchored in block 959069 (2026-07-21T22:32:59Z), 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/QZTBC2367031.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x587c79a4a4503dda69d0b3392d8b7027ed99a2ab840ee235905ac4f92020004b. 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/QZFZ32401475.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43250fadc63ed373c6bbfc6134b7e75ddd6f9cdb981c583779597f1027a5cde9. Chain 2 (Bitcoin): anchored in block 958126 (2026-07-15T08:17:14Z), 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/QZFZ32401476.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3fa9896f1550162d03700d613125efe8e8db3590cd705f21242bbcf755c4bc8e. Chain 2 (Bitcoin): anchored in block 959073 (2026-07-21T23:25:37Z), 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/QZES72428091.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x803f677fbffcb115895f9ae8e675d424fc2bbff624807182bb37a8ae7e9fb12a. Chain 2 (Bitcoin): anchored in block 958924 (2026-07-20T18:54:07Z), 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/QZES72428093.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf827b7f8dcd261b2e8cb03eec0a00e3609d8f077ec62a100590cd5d683ad693a. 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/QZMEP2470654.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84fb559d967c863a47f0da6aae3b3de8f0426a41fd53f8454ecf9815d7974e65. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T13:14:32Z), 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/QZMEP2470656.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72c87dad7f7c7c27a0eb1422f945b98ca38d45161949609051b37c85b64163b0. 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/QZMEP2470657.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57d313aafc770e9192f3b043fcf67d018b5c20d83c64c3e88382636492c6dec0. Chain 2 (Bitcoin): anchored in block 958346 (2026-07-17T01:47:42Z), 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/USLD91762421.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26ba1ed3e51ce684eacc81800ec5bfc423a569a9e47027b80227615b8be2a7dc. Chain 2 (Bitcoin): anchored in block 956857 (2026-07-06T01:26:17Z), 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/USLD91762667.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0fc1a887016286174367a6bb8884167acdbf7f835f41d59fc3f6bdd0ad1b429. Chain 2 (Bitcoin): anchored in block 958969 (2026-07-21T04:58:13Z), 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/USLD91762669.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ddf4a17e60333aae172521a893eee5039111b2d297b7ea8eefa748ce68e06d2. 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/USLD91763221.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb542e533e8d0aadbbcfaf37a8bd022a02213f5044ef081c80d21726518fa4727. Chain 2 (Bitcoin): anchored in block 958716 (2026-07-19T10:15:55Z), 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/USLD91766343.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6459f09d717bfc5d0caec22cd0ae57cecb745ca4aa5040c4048dfb290317126. Chain 2 (Bitcoin): anchored in block 958765 (2026-07-19T18:01:47Z), 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/USLD91766344.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf32aaeb2b174515e746cf922335aa9edb1a94a172a574cd61f43855e9776d8ac. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/USLD91766346.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c30202823999d757e6d117fccfe682a7c23488424604644f3500f39651deecb. 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/USLD91778683.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa50c4284f51afe4b805679515dc2f6e3452974a1a2cec9b0e9db9dc3d76644d6. Chain 2 (Bitcoin): anchored in block 958087 (2026-07-15T02:56:49Z), 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/USLD91778687.