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 0x67521723e3871a1199f88e4af6b2d2f2c8d6d46adb90fc1bd664d493d008a611. Chain 2 (Bitcoin): anchored in block 953742 (2026-06-15T04:47:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/8f8b8bd4-5bc0-45b1-ad7d-c759d74d32d3.json and https://artists.proofprofile.net/proofs/artist/8f8b8bd4-5bc0-45b1-ad7d-c759d74d32d3.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Handel: Water Music, Overture; Largo; Allegro
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 0x99efbd73e0525a0c35d997296b1a3d2269273b786136d34181e089d659aa35ac. 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/USA561044718.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c7cf40f56a3627c1454c2dcaa9db3e27f66e42fa6bbc86118ee3b0a4ef5855f. Chain 2 (Bitcoin): anchored in block 956351 (2026-07-02T11:38:34Z), 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/USA561044719.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf67b58c933417fc722a1a0ac84860d2f1c639af92d4b6dcb6b0ce87694328f05. 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/USA561044723.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0623a2879a4a110539d285eeb49df3eea02d9513b15aae39dc5b8d90cd66ee3b. Chain 2 (Bitcoin): anchored in block 957820 (2026-07-13T07:54:01Z), 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/USA561044724.
Handel: Concerto In F Major for Organ, Op. 4, No. 4. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x157bdea0471973d50fa3c409864c6a5d40eba5d2b61ff7a639bdc45880d00b78. Chain 2 (Bitcoin): anchored in block 957061 (2026-07-07T16:07:00Z), 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/USA561044726.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8418f7a9aa5fa8ef7ea0b06200fef65238fbf6d0f89e3b086e7344d57eb2ef3. Chain 2 (Bitcoin): anchored in block 959105 (2026-07-22T09:20:07Z), 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/USA561044720.
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 0xb6b0955a7485872991614b72415479cb3fcdb3e8c2f60a788c7117fd960e9513. Chain 2 (Bitcoin): anchored in block 959105 (2026-07-22T09:09:28Z), 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/USA561044721.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1c4334a45db0a3b78c8cefd4a8f2571a0a0cdae217876834b2cace828ad5a92. Chain 2 (Bitcoin): anchored in block 959163 (2026-07-22T20:54:59Z), 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/USA561044725.
Handel: Water Music, Minuet for French Horn
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b3025d55a0cdc6594a20539fcddbf92758553dce418f8787857bdd2172ccce0. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/USA561044722.
Handel: Concerto In F Major for Organ, Op. 4, No. 4. Andante
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e5b02d01bb64c8bd2a32f7a3d12ea89853ec4a0875c0168c51bdb8ab49bce36. Chain 2 (Bitcoin): anchored in block 960106 (2026-07-29T12:41:21Z), 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/USA561044727.
Handel: Concerto In F Major for Organ, Op. 4, No. 4. Adagio; Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd9096e8593e8f7ae510632fcce4ef11f5dae0880db86f1e1e8c91862b691396. Chain 2 (Bitcoin): anchored in block 960095 (2026-07-29T11:07:37Z), 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/USA561044728.