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 0x004d0a26673e9ad55281725ad97ba35e5727ac0da108243e1aa69247d49df128. 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/f689e570-cd58-4cc2-8d19-82e237113035.json and https://artists.proofprofile.net/proofs/artist/f689e570-cd58-4cc2-8d19-82e237113035.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 0xab4e3250395be9ca23aa4b4ee6ffa97cf0f32d35b2994df20757504189796211. 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/US3DF2457900.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea63d191254bdabf5f9b913e01826b0153ff917d4eaa85641edb99a777251c2f. 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/US3DF2490691.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f63e7d63168b88e20dad8149d9d7d17017627f4522a480fec9636107306a899. 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/US3DF2463454.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5480524b8b98ec9887a50ccd0da2ace4499dd294c5918e86839baf23f1d3e920. 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/QMANG2214241.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbfd0930b0ea5511af20337cdb3f0ffccf40ce4b75d3cb17d4c4cd0d3f096b00d. 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/QZVEM2351625.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea79bca06dd77f4467ab328a6f194385154c25db170dabecc661e1b0ce58772b. 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/QZVEM2351623.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15314c0d3873a0526ad703925df3c166079942d13f74c96ae985d4ef4f49e570. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/US3DF2425210.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87ecb163fc1d6b434f9dada110c95cda052ac6da0a6edfa3e7761db5f9931bfb. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/UKZGC2406951.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad9dd9aea947a4fc850112e47984609d04848fcae2256e8247d3db060683d4d9. Chain 2 (Bitcoin): anchored in block 960220 (2026-07-30T07:28:30Z), 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/UKZGC2405958.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c6329f3962403b59c0ba6e80ee26f362d509b717f0dac3f3a714514938d6465. 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/QZPEW2499010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9d6acc971a968a8e70d9414900debb3a044503ee0917f4f3bd4bb07f277e85c. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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/UKZGC2403612.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15314c0d3873a0526ad703925df3c166079942d13f74c96ae985d4ef4f49e570. 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/US3DF2425210.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb37ef4909702bf753c94d00a863dac87539a32299cca2669075a8ee0d1a13aae. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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/UKZGC2405684.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9d6acc971a968a8e70d9414900debb3a044503ee0917f4f3bd4bb07f277e85c. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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/UKZGC2403612.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83e97cbe954f5c6ea55d3247ba8cf8014fff3d5aa923a15f8f8029be71dd4beb. 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/QMANG2219845.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7eef6a82baa1473a02cbcd27ccee7b892f62306239ae67a9b11c2dcd9340f678. 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/US3DF2507850.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97a83813a1ff6e682caac9b7b13abcf32ae1c41a78a924c9de3a327787f28f7d. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/US3DF2507842.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc2d15d7766c9069e3253116a2b68a9eb111f534a7fa386b3366ff214ff55674. 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/UKZGC2408611.