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 0x8ec65906fa28ca4a65ecdb3be068045657607760053a957cb7d5f889080d40b9. 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/0c581e58-1f64-4d0d-927e-29f099214120.json and https://artists.proofprofile.net/proofs/artist/0c581e58-1f64-4d0d-927e-29f099214120.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 0xa4627a61798910c416a2899b4ab723c707ea0b4cea4e290c1ac3696e9ce8c4fc. 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/MXF399702073.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ee353d0b67e59d3b655db55924a86b641bce783e8461b2b894c54061e648b2b. Chain 2 (Bitcoin): anchored in block 958130 (2026-07-15T08:37:45Z), 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/MXF399702076.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1c658cf6313578cece4129bb0fa1afb56b1db415b07142f46efdcd06722f9dc. Chain 2 (Bitcoin): anchored in block 958130 (2026-07-15T08:37:45Z), 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/MXF399902498.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd88fcacae6206c4a2ba28f4f324d839e05759b7e874e351dd6c5a25d847866e8. Chain 2 (Bitcoin): anchored in block 958880 (2026-07-20T12:33:53Z), 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/MXF399902500.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb634547b8537b7c02338742409d8d7052d51bf4a521f195337677ac9d3afbc4. 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/MXF390002717.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c50b8e13525063cd1acbdbf4a3b60ede21694f816960455844d6f840732de2f. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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/MXF390002719.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf73d938036fea5748d1b9e1d1028b334a1d93df221c974ab6f372a385c56634e. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/MXF390002857.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4749818a3338c9497ea496d2eec768255b42864ec930dc14d02274cf44951b9. Chain 2 (Bitcoin): anchored in block 956482 (2026-07-03T10:33:57Z), 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/MXF390002858.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c3b31ef1e17d9dd5796c0dd8c840d37b9fddf939c1560be761b9dd1cb83df32. Chain 2 (Bitcoin): anchored in block 958319 (2026-07-16T20:12:32Z), 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/MXF390002864.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a75da9e92845bd81db7d17e52525663985ae2b3c4fc42cdd142f9c9086e4990. 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/MXF390002865.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d113a6176fa1ddfa5a17a97990f9555b92428bb566d93edbbe4ec22b26423e7. Chain 2 (Bitcoin): anchored in block 958256 (2026-07-16T07:22:18Z), 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/MXF390002868.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41ed406d1a2e784fc8f18e435e5ff472cbef362ae71931db23f0b3d02b1a4751. 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/MXF390103076.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb320df5b86b4318ff39720b106e9ec24d67c34e93b5b67eb91af7b024a8a6a7. Chain 2 (Bitcoin): anchored in block 958203 (2026-07-15T21:24:46Z), 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/MXF390103081.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5a413142e071f70cc4989a6f00f79722f79dcf16399965911ba9c6ca878dfbf. Chain 2 (Bitcoin): anchored in block 959010 (2026-07-21T13:22:35Z), 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/MXF390103084.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1f55ac459003ed22e28c38f3db2e2246b7f64409e252ed774c54401753dfb43. 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/MXF390103086.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2f9b118747319f1bc676708b0ae260bc4f410c6a9cee9cbf31ab2b3b23d4f37. 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/MXF390203316.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3df3ca24540ddf2c652324800d97ffdf7af60359585d8c2fa33be5d645497bd. 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/MXF390203323.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2234c28f3cb4100b22dccd0d18a36bd558eebab265569489e870dd6f5d9a8835. Chain 2 (Bitcoin): anchored in block 958726 (2026-07-19T11:47:20Z), 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/MXF390303485.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8bdacf88bd8bc14496ae48657a9d19d6a4965544b6d3d6d7a15a2249eaecaf20. 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/MXF390303476.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f6721f7e9e05c4c1e4a1346e9c0eccc12e151e6c58aa28f920cc3a9c2f5ef3d. 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/MXF399802273.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a8ea23486b4d0816b79b3b2aaf0a040e574c8b1d7883c5996580fff57486aef. Chain 2 (Bitcoin): anchored in block 958633 (2026-07-19T00:54:50Z), 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/MXF399802272.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe53ba874743d9f87387eca40140236e49330ac0e836cb3df67326b0c88021e2e. Chain 2 (Bitcoin): anchored in block 958371 (2026-07-17T05:45:43Z), 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/MXF390002863.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5cc88004b86eb826c5c848ca14b285cbf7555ff11eb629c150f82de23b388cd3. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/MXF399802278.