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 0x8b8fbad887fda11eba78e8c4d257718c33eb202942ea184318ed29517b07c40b. 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/d3c10f7d-7fa5-4e93-823e-2cb66673ddcd.json and https://artists.proofprofile.net/proofs/artist/d3c10f7d-7fa5-4e93-823e-2cb66673ddcd.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 0x2e7e239bdb6fca5923f1d8da57eeaea248bd43f2c2de1ece76aa6094828665d4. Chain 2 (Bitcoin): anchored in block 956637 (2026-07-04T10:56:23Z), 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/USCGJ1887518.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0a2e24631c6ddd231503c730a1eb5db53bb14a1f8856036dc838b1e97922562. Chain 2 (Bitcoin): anchored in block 958805 (2026-07-20T02:22:58Z), 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/USCGJ1887519.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b893248ad1bca95beb0acf3f94fa242f3468e284e1df5ae9f17da3fda184691. Chain 2 (Bitcoin): anchored in block 958793 (2026-07-19T22:59:45Z), 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/USCGJ1887520.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7b23db4aff537dda1676f7e3147af6eba6dfc1e160107cd5f8fca317c4131c3. Chain 2 (Bitcoin): anchored in block 958716 (2026-07-19T10:15:55Z), 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/USCGJ1887521.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x297901af5d4189f0d7cabcc021ae004e7b9bff98871d96e8ac0aa943286d8d29. Chain 2 (Bitcoin): anchored in block 957750 (2026-07-12T20:39:38Z), 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/US3QF2000157.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xedd73c355e71c143022939008084f810d856798ba8fe43bcf3fe08f89e91cb3d. Chain 2 (Bitcoin): anchored in block 957851 (2026-07-13T11:26:33Z), 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/US3QF2100212.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c739ec659deb8b02e92023d94cbe2508a0f8c640712b97c6ae1f71a114aa1e8. 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/US3QF2200001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb420e998e57e15bf66f5fb73243c7d38139a18b6cfd64a4148073dc17394baf0. Chain 2 (Bitcoin): anchored in block 957747 (2026-07-12T19:35:06Z), 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/US3QF2200005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x714e9f9e9cb34aa4a3bfd04c1adc026b1373d7dc43c2ec14d5b8efb8f18bb267. 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/US3QF2200006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4afd552dbe9ec6bbf378a9c911bbff4854eece4796e4e7ec0e29027c01fbae58. Chain 2 (Bitcoin): anchored in block 957750 (2026-07-12T20:39:38Z), 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/US3QF2200010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1cac03670784d35fee6ad433be3bd530f404baa90c143195caa1f4a61bdacef5. Chain 2 (Bitcoin): anchored in block 958749 (2026-07-19T15:48:23Z), 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/DES562310828.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03f1e83a92ba70fb8d861e2c91891bf0814adbc563979f5b199c84dc528f2e01. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/AT8272531102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x323d20818d2783f038f71a9a7aed4ea68c740f92eb057c7d1dcbd0c3f7ed153b. Chain 2 (Bitcoin): anchored in block 956484 (2026-07-03T10:47:44Z), 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/ATN262431102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74b858227e1ec81b4f6db9390823304cfb8b0a3ee891ed37ba9864bac32c7964. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/ATN262431101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34ef3b843e18b62cb81184186241ccf7772deeb94eef599cf5d1db43a9822108. Chain 2 (Bitcoin): anchored in block 958779 (2026-07-19T21:08:39Z), 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/AT8272531103.