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 0x19518b049c04c4db091bad705f01f95f5e4cec835d41bab1487563080085f0a9. 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/5c621266-4844-4064-9c29-13925f212997.json and https://artists.proofprofile.net/proofs/artist/5c621266-4844-4064-9c29-13925f212997.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 0xbfb1bc690c0fcd69c0a81e5bf974f8d0d71c9fc9da99dc81278fd2f3d9065e6a. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/NLCK41021522.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11693b3835a5046bb75ad4cf281bcb086a2f31de42234bbb53d48cffab03b364. Chain 2 (Bitcoin): anchored in block 958383 (2026-07-17T08:20:01Z), 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/USA2P1690214.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x618713e4ea5f513d4a6fb26370d4ed1a2172c230e1fba9e7307ef3f561460d6f. Chain 2 (Bitcoin): anchored in block 959031 (2026-07-21T18:50:22Z), 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/NLCK41051323.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36e62a66f792370cda0f896c3a9ababfa5fc9ccf0213617ca644f926b417268b. Chain 2 (Bitcoin): anchored in block 958436 (2026-07-17T16:42:22Z), 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/NLCK41083532.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4426e3259645c3683f940b768ad694ba484e4d82aef3180840a5c9cf8b342f6. 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/NLCK41095532.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb46b456b79350e289ffff16c09672b225577f025dc7d0e504a04ece83fddc85. Chain 2 (Bitcoin): anchored in block 959069 (2026-07-22T01:20:05Z), 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/NLCK41095536.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaec6cf79f90c644af3fc7f0401c612dc0c55c00106cbd4702ced8c0c868ded73. 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/NLCK42217631.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2660130c49876617ca7586b0f8b4f5efe3800436b7f5b87f98efc8c8fb310e9e. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/NLCK42217634.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96e4cac5c9f03f7e87b3ce831722953282a31b17ec458d8fa6034d00d4ec5f0c. 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/GB8KE2211655.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57601fccfcbda6929286c2b099f9a805d293f060b6740236741c7f5e70f9e8a8. 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/NLCK42233772.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69f78ae425284576e04e6069a2ba978a6c7aacd58bd4d2111d642a4b61999a4a. 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/GB8KE2403143.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e43055aa06db6393541846c5a75561f039cc4778fe4276b3109db2e1e439f79. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/NLCK42419316.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb42629252f63fa87f66ccc9bb7a1af3ed37c3b76b217e81b9315df946cd9fb6b. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/NLCK42510071.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56b5b04dbe0ce4190e91f5131aacae93d4de0288b5edb4455e895c3770371ce4. 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/GBTKW2090833.