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 0xd535581f46371d865c5723c0d5f0f44d892a86961b7bf459f7734a85d96ba86f. 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/411fe255-c0ec-4627-a3d9-14172c3acb0e.json and https://artists.proofprofile.net/proofs/artist/411fe255-c0ec-4627-a3d9-14172c3acb0e.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 0x7fb41254a28d3215162ab65fe8e1b292ba05d95580b11619c77af1a84c184aa6. Chain 2 (Bitcoin): anchored in block 959069 (2026-07-21T22:32:59Z), 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/QMSAV1102553.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x252c0fea84d73cccbc2d71bca5111d05adb0667f9a63d6caad9db8fc0683ea49. Chain 2 (Bitcoin): anchored in block 956482 (2026-07-03T10:33:57Z), 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/QMSAV1103675.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4f186ccfac118f42e162e8af6ca5b0deb210b3d5a3f4811433e97ec8729e932. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T04:59:50Z), 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/QMSAV1103701.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0cbb23068f4401a6190eaaf40298ed3221f8acf2a763b8d2289a1b76a070eeb0. 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/QMSAV1103782.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd77472b89d6d07aa36039d5bc99fd4af269ff4b659cc97e5ca58b333e681058. Chain 2 (Bitcoin): anchored in block 957888 (2026-07-13T17:43:59Z), 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/QMSAV1103878.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0194c733339779f66fd335b832abdaeadd90044ff37fb4ac8d9f3ce2d807ac0. Chain 2 (Bitcoin): anchored in block 958517 (2026-07-18T07:54:29Z), 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/QMSAV1103880.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9653f3405929b53b3bf3a56df37c6dee738929b0b3daa4d753cb692b073269c. Chain 2 (Bitcoin): anchored in block 959008 (2026-07-21T13:14:05Z), 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/QMSAV1103980.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7dce42bdd6ed991787bf5e403cb7ad6b8751be573e5cfdd0102b30323d1ad018. Chain 2 (Bitcoin): anchored in block 958920 (2026-07-20T18:14:22Z), 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/QMSAV1105005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x567abc5ec4cd9ccd6c41b608b813125000163dcfe16ac43f422770160bd30978. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QMSAV1105847.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d24d03b979f4548dfc89795abf7dfbfdba379250f9ea5ddf941cac65552c4e4. 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/QMSAV1105882.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc54e10874fe42b6d5714aa8c3671e1fbba032400f8372fd7beddd4321936db01. 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/QMSAV1106224.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ce84beea6f61638f619027095831015fa4dc31e39565cce76653791a57f5215. 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/USE7D2200231.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66495bf89ea6460f1374a2e15726a90f569482d4e49a76f8d3a0c136d743a35b. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QZNWZ2287883.