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 0x2c737f30cb9d8538d28db6164ae0df7f31c658fb62069f9018a41c4f7fd8504d. 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/d5b23839-d9bc-458b-b2b2-e849b3d99cf3.json and https://artists.proofprofile.net/proofs/artist/d5b23839-d9bc-458b-b2b2-e849b3d99cf3.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 0xb72292e667246e8af9b45be6c2b2fda2ee7d4ede150ab49ed158153a22e460c6. Chain 2 (Bitcoin): anchored in block 957898 (2026-07-13T19:28:48Z), 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/INM7X2100413.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x865173b51341ce8f46aec9f9cf48b904b058529086d056060baa9262f778a115. Chain 2 (Bitcoin): anchored in block 958582 (2026-07-18T16:47:25Z), 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/INA2W2300950.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8ff594bc6cbf2773a5c77cbb740ceef56c1a81b2e104ec4aed497030e93bbab. 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/INA2W2302176.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2171bdf7f34a381c1003ba3d283c1fa2eaf9fba565a3aca40e8b708417141bf. Chain 2 (Bitcoin): anchored in block 959061 (2026-07-21T21:34:21Z), 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/INA2W2400746.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f3303b212ba0582873e00382e6e81d113e69cbd94604651531b28c5973db53b. Chain 2 (Bitcoin): anchored in block 958667 (2026-07-19T05:04:54Z), 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/INA2W2401703.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2fc602f469d79c51f64af3beddbcd89f6209919018504585c7eb4b26745e28c5. Chain 2 (Bitcoin): anchored in block 958796 (2026-07-20T00:01:46Z), 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/INA2W2502086.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce529054e428d728a66ad44f892d3b834e69e6d9cdcd16b8924e45801cc9f5b9. 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/INA2W2502767.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac29d48a94b7e34d4bdc49be48657769afd4302aa70faa5e7c3fd0a9a7ab18b2. Chain 2 (Bitcoin): anchored in block 958935 (2026-07-20T22:08:19Z), 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/ING212536390.