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 0x21e255d5324dc1e30162542a3e9eabfd886b36df6a4e481de339887fc40c42cd. 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/06e6e9b4-8352-4955-badf-06e8439c44bc.json and https://artists.proofprofile.net/proofs/artist/06e6e9b4-8352-4955-badf-06e8439c44bc.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 0xf6a4d18a2cd6ef04dceb97c74852e7fc01d5246d82f371d8aadd6ac409a233a9. 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/DELK21800140.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e06cf85f63c1581574a4b49787390b564a8d586b20af28db2329058558fd1bb. Chain 2 (Bitcoin): anchored in block 958959 (2026-07-21T03:51:22Z), 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/DELK21800158.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7005b6305c86952bfb6a9753f4af3fa826bf2d03dc3edad8321eeae905893e91. Chain 2 (Bitcoin): anchored in block 958355 (2026-07-17T03:11:50Z), 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/DELK21800164.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab56f5a1cc892a12195f2486c599752eb87003a4265bd4d7f8676ddc9c2e172a. 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/DELK21800167.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x221854fc31bd807098e952cb9aaa2d12f8e0adf8bfa1877555e18460d848e7fa. 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/DELK22000346.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3704d9f23bfd6a26efb6127a4eedaa8b5990c3d863d64bae091f1ca9a2cc581. 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/DELK22000347.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb885fca5fb856a248c0aa930a3db135c3a3cc05dd763a21766f1d76a92b8fcf8. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/DELK22000349.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb885fca5fb856a248c0aa930a3db135c3a3cc05dd763a21766f1d76a92b8fcf8. Chain 2 (Bitcoin): anchored in block 958388 (2026-07-17T09:14:21Z), 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/DELK22000349.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x880bbb7594ddb49d161694a9a0fbe4ec95ccd6cc5a439881a050eb2777c545c1. 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/DELK22400154.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0cffc9d4a0dd609165e789da9b689bcbad55164cdde236a4d5a1a8def0c0aac. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T15:55:19Z), 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/DELK22400152.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4177d0c15a49c7c8f2a17fbf1c4d580c745d5403550f27ee09c195703f989d87. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/DELK22400155.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4177d0c15a49c7c8f2a17fbf1c4d580c745d5403550f27ee09c195703f989d87. Chain 2 (Bitcoin): anchored in block 958830 (2026-07-20T05:30:12Z), 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/DELK22400155.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c0f13c25290832d021564429a9f2ea6d370c2761528d4cb2ab0975588209e68. Chain 2 (Bitcoin): anchored in block 958812 (2026-07-20T03:24:09Z), 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/DELK22400150.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfea991fbb545e9e161a1d61071eac0f82dc8752a1ba219ad68df09521d7409d0. Chain 2 (Bitcoin): anchored in block 958303 (2026-07-16T16:39:24Z), 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/DELK22400153.