thumb|Church of St. Charles Borromeo. thumb|A view of Noto Town Hall. thumb|right|A balcony of the Villadorata palace. Noto (; ) is a city and in the Province of Syracuse, Sicily, Italy. It is sout
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 0xdd9779df21380315711803dab960c207e27265b1287ef162a55fcd8e92e65acb. 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/00c71316-48eb-411e-878d-c0b53e4f69e3.json and https://artists.proofprofile.net/proofs/artist/00c71316-48eb-411e-878d-c0b53e4f69e3.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 0x4b1b552314efaf39bc7ae015956f1e1b8f63f59cc0ef4780dd45b167b7127ec1. 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/FIS202000020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd78ad33fe08d44092dfa79ba7317d9b4b4786f788649adb1fdbd4d62b3dc0c2f. 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/FIS202100018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xccf475e0f0d8b208d5cae14711a643c8a39535bfd85d92ea7dec01a6294e60ca. 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/FIS202100020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39c062dc9143387b0ec9c4581904d5fcf2df13d743135cc65909808caf81f340. 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/FIS202100021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd78ad33fe08d44092dfa79ba7317d9b4b4786f788649adb1fdbd4d62b3dc0c2f. 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/FIS202100018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf983ab861d930a08900d484ddf01f73a002f332c2bfa20c68ca50328f1b564b8. Chain 2 (Bitcoin): anchored in block 958724 (2026-07-19T11:19:01Z), 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/FIS202200002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49f73f495231db4fea3d144c8ae5eed4049def877bac9dee276b7ddf8abfaf89. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/FIS202200056.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad5d6f36b0d281f23d1c413071d1de5b1cd2ce9e2ac4302bf76c798f8819c40f. Chain 2 (Bitcoin): anchored in block 958670 (2026-07-19T05:26:23Z), 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/FIS202300015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e5bc652235d7e2d3539b08ff152854dc617343dc80d3125848e04d0d6ac3d2a. Chain 2 (Bitcoin): anchored in block 958711 (2026-07-19T09:26:32Z), 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/FIS202300039.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a4e8a78d4c31b9e83d03291ea446a8c9ba2cd6502add685ff4ad433017b9214. 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/FIS202300051.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5fc0b9d96c9dbd655c2a48f645dec0fcf6c45cbc05dbebba07ea7ed5cf51d29. Chain 2 (Bitcoin): anchored in block 958104 (2026-07-15T05:34:05Z), 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/FIS202400033.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0e1928814e35866382af9953b8e10247c63e71e1e46ff9805ab9407133d9484. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/FIS202400073.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfdb9fc4dce2f3fbb4edda96cd035d0d4d6249978e68318c041189d781da98ad5. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/FIWMA2400045.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a9e64114a1ec71a434ccacfa9ccea52bb3c90d464e95cad84f6be78a2949972. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/FIWMA2300227.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb64f5daf999735dca00d664ca3f9fae9ae57da6bd7c1b64c26c56813e05c40df. 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/FIS202200042.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd78ad33fe08d44092dfa79ba7317d9b4b4786f788649adb1fdbd4d62b3dc0c2f. 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/FIS202100018.