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 0x3bcb9211844e67cb2900df8b591e6c865b6fa332dd5406cfdcab6da9bd302cd0. Chain 2 (Bitcoin): anchored in block 953877 (2026-06-16T02:39:16Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/0558d303-d1b1-414c-b4ee-cad2ecaafa83.json and https://artists.proofprofile.net/proofs/artist/0558d303-d1b1-414c-b4ee-cad2ecaafa83.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 0x28f6b4d0ef8d281e236e0bd27a9270bd3d22b33c250beeb918df79f6b43f67ef. 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/USLD91716322.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62b95f430d20fdab143de9cef2b25719130b4cfe8f03fb6c7276b51df603aa8c. Chain 2 (Bitcoin): anchored in block 956891 (2026-07-06T07:16:32Z), 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/USLD91712417.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf0798f040a04ab49ea04917a96f94a276dc81b19e0e52b1caefbc3abe2be874. 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/USLD91712418.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x302d05b8e666e049a9b5609b11f632ee03dd6026ea7aca4e122c40876b3f2bcf. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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/USLD91712419.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79033f6a735445bda82ed9a5627dba5800389eca627f566b2a1d36a5cf684b21. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/USLD91712420.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeddb169f84a9a344bd3d74bfda2107dc3f69541102173c3a52cd4591dd73f03d. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/USLD91712421.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36e633d7d5dda0586d18ab45a5fa192989e3f7f4a7781edd8ac1a5409eb8c799. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/USLD91712422.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21a31d78411d831e1b47726c698785bfcaadf8a3cfeff19929588012ddf0ce49. Chain 2 (Bitcoin): anchored in block 960164 (2026-07-29T23:23:05Z), 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/USLD91712423.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ee55c212848278f7ca1c9aa1b574ce6700c84d8867dec020678f22fac667323. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/USLD91712424.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x456216f30d2f76d5f698a030abc43d3471253c35e9f6a58379345314f148aa83. 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/USLD91712425.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa055c350b52044b6bf68cbc9ca1d0125ad6c5d52aa8cb7b34db8e2e410702bc4. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/USLD91712426.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88d2b115a004c125f92e5e52113598f30a812f5744847ab33eb8420c81f25233. 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/USLD91712427.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa95987202331ea48d0c3a0e39ae16ee24d332eabc7ae9f04e7a93eaca27cd41a. Chain 2 (Bitcoin): anchored in block 960095 (2026-07-29T11:07:37Z), 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/USLD91712428.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71c6dcce45ebd350759dda135d4ed0da4ca1e80e8d5b042bf213426ced889e0f. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/USLD91712429.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf505392dacbe4de6cecd99e27c96bd06a02ceb41057dffbcc4a055173fe90359. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/USLD91712430.