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 0xa75dcf4ea7e3e71b6f35d1f5a2a0e38efcff9840096376011b422f2e5dc5555c. 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/758d274d-02b6-46f7-8f02-848e73627d5f.json and https://artists.proofprofile.net/proofs/artist/758d274d-02b6-46f7-8f02-848e73627d5f.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 0x614fa9cf9789134491ee9daafe15c32b13c6693ad5d19a619dba68a6a1188909. 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/PLA551300228.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0eb3ff02e99c5a2bb7cb14ccfa16fcb7b347bc2fe6b86796771a6565912298d4. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/PLA551300234.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb57f84ba5bb8b79bc4b620308b882d8cffe80747e1f9d1e6075bfba81a314c2c. 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/PLA551300235.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94f90ea6e8d14333acfe9c99eb2f4ec6ae4b930ec9439c89b4abffb4f6aaf5fa. Chain 2 (Bitcoin): anchored in block 957899 (2026-07-13T19:36:39Z), 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/PLA551300229.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x420700c7c1e376048612de0b69f40aed81389bdaade33f5019d7ea7fac43deef. Chain 2 (Bitcoin): anchored in block 958541 (2026-07-18T11:37:54Z), 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/PLA551300231.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b4ec3799f4f4c0f7cb85942a9204925c13697aeec948c3c1ed061e5e55687f6. Chain 2 (Bitcoin): anchored in block 958436 (2026-07-17T16:42:22Z), 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/PLA551300230.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6843b6a951e70b8c980a2bfd9c916ebeb543620732986d72cd1eb18dc0dc376. 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/PLA551300236.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8ae1125bcb0843fae7bde9da99856d774d1c969e44e9908d92a0cac1739523d. 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/PLA551300232.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbfd067aeaee7d47d5ef46e276f0e1b9570c78bb517f0c3f935dc6c510233f97c. 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/PLL071500036.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x737ed1be4e9b30be948642ee471ad87b1229056714edee9a1b06c96f1c836bf8. 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/PLL071500087.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x810d481ac7abb83a71c68d0c6d1955c4c47ae4f670faaa564035d4feceaed3b8. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T02:05:55Z), 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/PLL071500090.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c03c413f2d417954c83c21528665d64e226495d644ea7e2c6646cd75041751a. Chain 2 (Bitcoin): anchored in block 957899 (2026-07-13T19:36:39Z), 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/PLC591900303.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x151fa92c404be62eec062151d2cdb03b067aa04de347baf10ad5fa2abcbb07e0. 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/PL96N2300004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x417dc15f3bc8db6065227a6bb8dd16f35e08b1ed96567d3152e030ea36abb8be. 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/PL96N2300008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe32ecbe822c20c652733cf9271de58eb2594dc42e2ac3f9a132d35df8a165166. 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/PL2DY2302218.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9b071e625d153508ea1c6556845b86bf69b08cf389fe4bc777fc473b10b10c6. 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/PL2DY2302220.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9be4f7898413b8e2f73807482006686215bc64a4076a2e5bbbaf83ad679a38e. 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/PL96N2300003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x151fa92c404be62eec062151d2cdb03b067aa04de347baf10ad5fa2abcbb07e0. 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/PL96N2300004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b8a43fe9edd6c441c5ce0ea0f57569fd292d096a090c715ef38cbb582ed3c7e. Chain 2 (Bitcoin): anchored in block 957041 (2026-07-07T13:25:45Z), 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/PLD111700028.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4289947b94c7311261776e2a827b0d5a6bc5a1755bca45c6ad04d4fa02996fa. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/PLD111700030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9064c4ef27d2e5ce1039dbcf137181ec267d506dc37609ccb811813384e03d48. 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/PLD111700064.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac7880c2b9d1c8ca73b2b64a574cfd6d4706901cd118859eafca255c033b6b27. 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/PLD111800038.