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 0xb61e5b4c70cdb76ca42d93beeda029473811235a68cd2d937826bc45966e1944. Chain 2 (Bitcoin): anchored in block 954065 (2026-06-17T08:10:43Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/50eb34fc-e841-45fd-82ca-1df97dfe4031.json and https://artists.proofprofile.net/proofs/artist/50eb34fc-e841-45fd-82ca-1df97dfe4031.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 0xc82cc8a93120ec0ca3538d5459bc5230e9b57518ed4f8169dd6a7d7053739bd6. Chain 2 (Bitcoin): anchored in block 959152 (2026-07-22T16:23:52Z), 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/QM6MZ2398160.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb40f67330f04dd811dd579a40318d7667b8a141745fb08ade4371e502fa9bead. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/QM6MZ2398162.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd54a22cb40e1ac6776fe1b117d25366047be906da4e960f8f29fb6b80fe0c480. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/QM6MZ2398163.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13faf1b907be9c82eaea20ebcc7da469829248a8ef66fecea99239b9ac05971d. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/QM6MZ2398164.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7380bcfb284da2b79aaf2a14d9f081a526c24a7207144bb423fb37045a700823. Chain 2 (Bitcoin): anchored in block 960354 (2026-07-31T05:48:18Z), 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/QM6MZ2398165.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcfb8fc58525efb7a3944af480daa71efb5d3a10d85f5806b84f2a26109b46444. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/QM6MZ2398166.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f1b76aae9e3b31e44004868e2846356e1dd3a0c1ec04e7982c246f645946a36. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QM4TW2133782.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf45cfe36f442986cc94d70057358ca0f7386fcca2d81d7bd142b36f7caee974b. Chain 2 (Bitcoin): anchored in block 960209 (2026-07-30T05:15:54Z), 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/QM4TW2192335.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe7b2e8410bab7bca69ea242914593214b8d7bc6f1c1a6e02f3c9285c22f098a. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QM4TW2192336.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d7b6fcdbdfde517a59055f2013832956b6d02d39b483e34c223d39cb59c8366. Chain 2 (Bitcoin): anchored in block 960121 (2026-07-29T15:22:21Z), 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/QM6MZ1879906.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xafb8ea395bb5153f2f0efd239fc6b755487e83049e1ffdde810f26cda1599e79. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/QM6MZ1879907.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1217eba4815235d133f2da34d515f3b8f62ce148b44f11ebe5f8539fbda48284. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/QM6MZ1879908.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0399c0aead7b73e943c0a22d692537e1de3365292bbe18598028b28c44d49c45. Chain 2 (Bitcoin): anchored in block 960150 (2026-07-29T21:51:49Z), 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/QM6MZ1879909.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27ff152ab04b9296d5b696feb740bd27d5fc9f14e039691e7d6f9242bfa8f9b1. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/QM6MZ1879910.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22a9653b1919f272dfd08420085545f22e1aae57350f1535f6343b709f88ff2c. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/QM6MZ1879911.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbab887bda20f1881a1373d11da2136401ede2589c13636683fbdc3beba5eb4d1. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/QM6N22231442.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd9927df3699359a78d1d0e0e13f90be4f76ceb54499a6a784a39d2c8f6a2cc8. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QM6N22231443.