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 0x42597fdc442fe3224778221a7ca8ed981d867afb2b454ad44dd23e3f054b502b. Chain 2 (Bitcoin): anchored in block 953783 (2026-06-15T12:24:43Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d6837fb3-89e8-4cca-91fe-933f37955d86.json and https://artists.proofprofile.net/proofs/artist/d6837fb3-89e8-4cca-91fe-933f37955d86.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 0xf2256a2edf5685b8ad3096b80c7ac969fa232b0fb79f88e9b6b31de7a14bcb04. 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/USLZJ2253549.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91cbca8e8fb477ac60ed6de4467c7c34ff2cf12b611cc2b4f5078ad1c073d2ce. Chain 2 (Bitcoin): anchored in block 958415 (2026-07-17T12:50:13Z), 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/USLZJ2253550.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2a40d9a607f643062a4c9155e3be5f7866a442dc4db038fedd0852fe233c856. 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/USLZJ2253552.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe855be9fdf24bbf6e0f88b83a1d7f687c0bb1ea97b1bb14977556041b46a2bbc. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/USLZJ2253553.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8410a1ba16b7b57b1fbfe5fb06970c3e5cac3273835e778a135904d5a216b03b. 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/USLZJ2253554.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x080e28f012a797ff15e1fc879d22295c2c180c8ab288f33bfaea8d7cbd7eea19. Chain 2 (Bitcoin): anchored in block 958415 (2026-07-17T12:50:13Z), 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/USLZJ2253555.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd89a3ecc714e9a01739e8e70ec52bd316fcea7eb102a5cc39eae61976c029bdf. 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/USLZJ2253556.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb3740520770ab5cf47db3bbbab8d2c1dc5b66173f49a0612540915e5cb2e255. 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/USLZJ2253557.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b22c85570f39fb45f1bba8cbe3187923f8240cd8874535706d57340d997d657. 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/USLZJ2253558.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60543dc4a336f714d5486aa5a730c24706e068a101f1d205f24eac30f4ead48a. Chain 2 (Bitcoin): anchored in block 958366 (2026-07-17T04:59:09Z), 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/USLZJ2253559.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a1de0eb19f8f10a0275761f47fbfc2cb671cb4f22ceea5790bafba22e45ed57. 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/USLZJ2253561.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b85b06485bfee33598a391aa953559e32e7cce31441133e290478dc8b3e2882. 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/USLZJ2253562.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7acc38a807553d6fadcf879b46d5a9cbf59f118b16ce5f9e8a5b3f04b50d2d67. 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/USLZJ2253564.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa58dd3c5a080459bde55101f2473503a0acd6a105a1586b1d19e0742e8848cda. 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/USLZJ2253568.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74aca63cdb2680fad0dcad4404d83b16d5b5a70e324d46fade28309849fe73c5. Chain 2 (Bitcoin): anchored in block 958561 (2026-07-18T14:22:01Z), 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/USLZJ2253570.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a8bfe8188c823b3d1b50ce195d15416aa49a5ad44fd4313d610e5202ecf1259. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/USLZJ2253571.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4b763e4f03c707d7564a6959b6d833eefdf16c1af9ddaaa8aac054f4bd4ff26. Chain 2 (Bitcoin): anchored in block 958415 (2026-07-17T12:50:13Z), 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/USLZJ2253574.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5056ba24f1b3afd604e6414535678e90ef96b7fefcbdfca644f11836eb0f8d3. Chain 2 (Bitcoin): anchored in block 958415 (2026-07-17T12:50:13Z), 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/USLZJ2253576.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9bb92454bf321765fc3224d2ecf24096fe10f107afed9d0d7e883297f8e2805. Chain 2 (Bitcoin): anchored in block 958357 (2026-07-17T03:33:42Z), 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/USLZJ2253577.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x507de181f757c4bb058aa31459e9620e97fc6399cbc4d97124ba7197261b2942. Chain 2 (Bitcoin): anchored in block 958134 (2026-07-15T09:14:08Z), 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/USLZJ2253578.