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 0x03cf55fd08d7fc3caf60016afa9f004948b6829171e8efacf52d9ccc044dd8f7. 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/b0c35669-8bc8-4502-b322-4683fd99d9ed.json and https://artists.proofprofile.net/proofs/artist/b0c35669-8bc8-4502-b322-4683fd99d9ed.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 0xf6efa889557f09cc9a7ba3d31050cbecd8370398e6a2b1dd426212e10b6ee1ed. Chain 2 (Bitcoin): anchored in block 958137 (2026-07-15T12:29:13Z), 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/GBSMU5883518.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ca26afae5ac1f7397b412c7586fe9a432532df53beb8653afa4655c5766bf96. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/GBSMU5883525.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65ce7ae52fc9466ef67524c3aaa786601ad406c9b80f5845f73a9a4f65019600. 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/QZ22B2053585.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed77e3c1e17e652d11f693337e903f0ff7a94cc6afd94e33c463f77c647e69ee. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/GBSMU6063339.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x639976b13b1b95dfa599b529b89274314b0a8a70ae318991da01930deacafc42. Chain 2 (Bitcoin): anchored in block 958905 (2026-07-20T16:14:34Z), 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/QZGWW1987837.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa453a1777f5e0a679d8a39222c1948eb73abf72e3bfd515d900b22867966b4a. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QZGWW2105943.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65bc8970b7fd04cb62b8896f4d050db7bf011c8f9cf21db7b6a8fe2d13bb7143. Chain 2 (Bitcoin): anchored in block 958666 (2026-07-19T05:00:30Z), 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/CA5KR2220631.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6fc1fc7d9d258bab48f3c2db3c1ca63beaba148399047da19dbd90565f17636. Chain 2 (Bitcoin): anchored in block 958420 (2026-07-17T13:33:01Z), 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/CA5KR2220634.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5cd4f6a1b24b7f9ec0132a065f8f9709a87c3724ba08811bad0df834481e3c00. 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/CA5KR2343319.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d8ed63b73ac4befe3c73a05804aac520dc236c7b80326d2525f2a35bfdb9b35. 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/CA5KR2343320.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30f6470eb39de99d9da5ac071194bdf6517568458f3a1b555cc6dee7bfe6d1ae. 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/CA5KR2343324.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6d9121db2fc2c812f27e041f695f6d3c56a78bb036bfc7cedf94fc7bb283c2e. 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/CA5KR2343325.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8364f309b2815d910ab3ae7adb69eeb51962b4cc7b88823e4739505e7cde9a37. Chain 2 (Bitcoin): anchored in block 958202 (2026-07-15T21:23:21Z), 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/CA5KR2278942.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c1b8a7765b198e35f8902f4e37fa027e43519c31c5dd4c1e40440495c3677ed. 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/CA5KR2278952.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x714e94888209e8b079b7119984651254b10ee31d2a58b84b457cc3d6ae2b8914. Chain 2 (Bitcoin): anchored in block 958897 (2026-07-20T18:00:11Z), 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/CA5KR2278943.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8cc65d8d47fcbef8d14995f502f195e06425a701ddb5f7a83e30f0ea6e88e3c9. Chain 2 (Bitcoin): anchored in block 958510 (2026-07-18T06:38:22Z), 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/CA5KR2278945.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32bb39fc3fcf6692acc32cff6b43d7dd2e8011149854928978c8096a595f3d37. 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/CA5KR2278947.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa796f686b83dd3ce779e90a8dbd96f7a54a900b6166a230d26e7d79c46bab84c. Chain 2 (Bitcoin): anchored in block 959051 (2026-07-21T19:48:03Z), 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/CA5KR2278951.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcddfa090c554ea77eecb18244ed7ed15cf58582900395ffee68adc27b9a31c62. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QZTB62359754.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf95c165cd2a9f31e3d675c7c8bf5189d7a299f330a05dbca5e7b4ec81104a081. 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/QZDTV1900045.