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 0x79397fe31c6d362aa92d3777ab885e2557abc2efc30e17cd2057641f9094daf4. 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/d2e6d401-b12f-4e80-bce1-06ef9bd15141.json and https://artists.proofprofile.net/proofs/artist/d2e6d401-b12f-4e80-bce1-06ef9bd15141.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 0xd40d04851aca1fb7dc8154524e49c3b67784b12ce470275c7dd531d8afad2b87. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/QZMZ92014371.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5350687328bce4728a54efc262d3cd510ea317de934675b0141d481194f7e90. 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/QZGLS2030546.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x830c3de3a3e6e4ecb0fad3ff019486d110ea7f1f1b35574cb0b28c13e881bc14. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/SE62M2120103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0b362e9304d6c074a1967ed6238af9cdfa3818f7239a0ff6a9302ecaf44263d. 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/USCGH2269897.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb63dbbbceff4cabe112174e2f77a4022a1e8ab13a0f53f52a32704780975a761. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/QZGLM2456873.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05ea37be299a6810f6db1c39078f3668486ca6fcfd875e01b0c42dbf36972428. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QZW9K2335667.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34dbd3475ff382b40e6a70afe94d2ff47312995eae7312bf2b59cfbf98caa8ae. 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/QZFYZ2345714.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22ba4ac14ec8eb938d952b4f5f56f905b3c9ca77e61071642a96d4fc66c87cac. 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/QZFYZ2344413.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24f9dba4b68957a7cf03feeddedd04b74ece565f470130fe0fd320f5ad39a7d5. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/QZFZ22373981.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9eb135aef5042ece631ccef8289b30972d0078f5a5c0589eab53380a9939f5b. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/QZK6K2080278.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97100371ff0229f0d2fac3965a4aced65d1ee3fedec2e5038ecfb96f41bc19f9. 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/US7VG1989598.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f1ef289f66443d53d3de12c354e9e185fe6c916e5deae8bedad3cea422d0926. 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/QZNJW2396786.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9329e6879c41d2ff74f1888a451acd4b48306e33ab6ef8ebe0b084c716c23fba. 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/QZFYZ2092991.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c45a72b5cd8a7127b807edc3e5d0087a9db2b4d6f3dcc550772070505fbbb2e. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/QZW9M2473971.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca476d962b70501afa09ef34980f6121b9a9858503c706f527991a0581792703. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/QZNWU2145604.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3f6f87347726ddfc98574c25c828feaf8f65cfc74cdcaeb3c5f4a8b33946c89. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/QZ5AB2155782.