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 0x8907b6ce450c8d4f7e0cf8e586d410b3251c1c327d76ac3195272d16c164acaf. Chain 2 (Bitcoin): anchored in block 953727 (2026-06-15T02:33:01Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/9075f147-3d71-4b7e-aeb6-fd0e01cc49cf.json and https://artists.proofprofile.net/proofs/artist/9075f147-3d71-4b7e-aeb6-fd0e01cc49cf.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 0xbfbbe7d16baee3ab8ead2ed12931e30b423e4db09229ec63ec2a78510b5e6202. 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/UKXN22515593.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4461f70c74af6b8b3147badb426d26ace98ed2b91fda2a3237f639cbc84ee84. 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/UKXN22515594.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14c97d895713898f5ff3db1cf4b4eb8d16948aec404b0abd0f5ddf469d510722. 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/UKXN22515595.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04558838efe3eb43dd3fee1b9035cd872e68e009c243ee27afed6ecb5cddd5c3. 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/UKXN22515596.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0cff2be41c4243cb687fce783900fe3d8fa889a1e649a662a29900936e78521e. 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/UKXN22515597.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad5da7adaf05bf180cd2f78d7e2c4b4bf9f011e4489a79581aff8638d3f18a30. Chain 2 (Bitcoin): anchored in block 958169 (2026-07-15T16:16:18Z), 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/UKXN22515598.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7e014ec7c23ba2a6077014ab52db04c3f33d246ad588f36afb7c5d3f2e9736d. 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/UKXN22515599.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ba47a3d3a70c8fe122e0095f99d71e3423ed0eff033095365286a4e22d951b1. 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/UKXN22515600.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb85f774134bc483c33d7fcabc5699cc70469b2a268148aa24b1dbfa70d27040. Chain 2 (Bitcoin): anchored in block 958271 (2026-07-16T09:16:54Z), 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/UKXN22515601.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8e8ab0149749cd2404481ae678c6e1c416717aec8fc16483facc0a00f0ccd4a. Chain 2 (Bitcoin): anchored in block 959355 (2026-07-24T03:24:16Z), 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/UKXN22515602.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64ad53ed10dde1e1c6d654a6bd9c962e90e954cf7a1a216da0d31c7988202438. Chain 2 (Bitcoin): anchored in block 958152 (2026-07-15T12:00:27Z), 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/UKXN22515603.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x971e134cb4b3ef4cecf34460262ee951a6f016ad764fab21a494763ab954a978. Chain 2 (Bitcoin): anchored in block 958079 (2026-07-15T00:21:05Z), 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/UKXN22515604.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5e027428cc3d1dab16845f34da83cb58e7a4cc80ca766b389adc47de0240a03. 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/UKXN22515605.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae8b5cd3f711c47ada174981335e09e97a9b51292d2b4d987f45c846c1f609d8. Chain 2 (Bitcoin): anchored in block 958170 (2026-07-15T16:21:50Z), 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/UKXN22515606.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcbdb6746ce27f4ecb6e2e3a9f3f04d9dd20c3be6d9f09fb1a1feafe3e579e256. 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/UKXN22515607.