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 0x41c8f7a2eb6483e47cd8033cc86ba9768c684d7763085aa3edb74c9ff8e01899. Chain 2 (Bitcoin): anchored in block 954647 (2026-06-21T04:36:58Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d7139f19-e257-4c48-9f30-d4a3705d8e0b.json and https://artists.proofprofile.net/proofs/artist/d7139f19-e257-4c48-9f30-d4a3705d8e0b.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 0x57487765cae90608cb848ff19e7b89d9d08db0e33fa254bc8b315b9c41102f66. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/ES71I1600020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda2012db6cdaec4ecf587c7bcc75041dcc8d2b6cf932a2b6a93d44076757cf93. Chain 2 (Bitcoin): anchored in block 957057 (2026-07-07T15:21:38Z), 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/ES71I1600021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1abb9ead723ad591b4e75576650c38a444d09106b38e767253150ece66f89207. 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/ES71I1600022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd7718683602b31d5f58a44cf1ecd7ceb04db964f3981266f6962930cda35fc8. Chain 2 (Bitcoin): anchored in block 957064 (2026-07-07T16:43:08Z), 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/ES71I1600023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3290c138db5aae390584375180658b576b581b3fb95acc44f8c9b0995cdfc7c. Chain 2 (Bitcoin): anchored in block 959163 (2026-07-22T18:47:29Z), 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/ES71I1600024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x241106c3b897c0c45664bc093d7ec4c4d439369f2e0c27f2cdbc7da4e6754006. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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/ES71I1600025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6687b51c6975c7aa5678fd532637fbc2f549cf41268a75f0d3eaa53e2b15bb3c. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/ES71G1504262.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb46c8eba5eec2efc6b36974c175a54e202862ac60db03326878ebe13c75e1209. Chain 2 (Bitcoin): anchored in block 960317 (2026-07-30T21:35:24Z), 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/ES71G1504263.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3161648e982204a2debb258aa7f13f39efb0eb0a7a6a77ee6a6b256b724a3dbe. 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/ES71G1504264.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8729866d1a3f35f3778fcfdbcc4bf1bf12f950f49019c915ce8aeb6968a9a62f. 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/ES71G1504265.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d1d4498d31d601d19c68f3368443865e0cbe2c8e5474725f88a96c97b48fa54. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/ES71G1504859.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09dbf7164dd243d21bae9c551700beb814fb47a904d7f8cb49a8b1738c0581d5. 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/ES71G1504860.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfcc0139939e69f15bcf2d1580b54f862d0daac8ff877b00081001b9ff87b4bca. 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/ES71G1504861.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x219d30734727d6049e78c6077af41adfaf48c5ec0542ec59a4a5225083610073. 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/ES71G1504862.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6a2a18d338ebeb9573d654762233f2f47aea438d13023f4587d69deaf4785c2. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/ES71G1504864.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdcd101a306b976a52611883a97b55939f0b3d13f93b1741edbd15a4c6cb1e95b. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/ES71G1504865.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf48a954bcccea463f136d9e8ac5b3152ee71369829f4f198ebfe5c779c3f38df. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/ES71G1504866.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a9ea4316938aeeb22b7a8c082ecf21b35feb864d456dbca7f3def8d1b966fa3. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/ES71I2000021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b5b71891ca2eb4c2f8b4a04a0bd2c5f16a28af5c6d1f248fe9a716e8f07620f. Chain 2 (Bitcoin): anchored in block 960105 (2026-07-29T12:35:17Z), 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/ES71I2000022.