thumb|150px|Arawak soil series. St. Croix, U.S. Virgin Islands. Solum depth is 11 inches and soil depth is 14 inchesThe solum (plural, sola) in soil science consists of the surface and subsoil layers
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85835ab7ec24eb4e42c17c004edda23e422b135cc8e6ab18fd1ffd1c9b12f7ed. Chain 2 (Bitcoin): anchored in block 953408 (2026-06-12T19:28:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/77b56adb-4695-49a1-a556-d74839dfb28b.json and https://artists.proofprofile.net/proofs/artist/77b56adb-4695-49a1-a556-d74839dfb28b.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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c7c00b6dde0af60c7fad3c112be77ecebbfd095479da1baa98a28215d3aa1fb. Chain 2 (Bitcoin): anchored in block 958980 (2026-07-21T07:04:12Z), 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/QZHN62322781.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd448f9a56199ecd469038093902293b073b56b233ae2de85a85f4d44efc320fa. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/QZK6J2499093.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c081884e6ae1f7a84c920a00a3dffd454e34875e6b4b3622138bd6a94ce5dd7. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QZZ762488283.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6152bf11b22f1970260ffa667a75111c651c6c159392353eab383f403af5d29. Chain 2 (Bitcoin): anchored in block 958350 (2026-07-17T04:02:32Z), 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/QZZ762488284.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7f58db5f566c0a8c6626c1568adc38659a3111d8a27909ea410094c34855f68. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QZZ762488287.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b1830c62270b3ca2f467dce0d357249544fb04632bfa8f55d1eb312ad52b86f. Chain 2 (Bitcoin): anchored in block 958816 (2026-07-20T03:51:05Z), 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/QZZ762488288.