alt=Maestro - an Italian Conductor|thumb|Arturo Toscanini was a famous Italian Maestro Maestro ( ; from the Italian , meaning 'master' or 'teacher', plural: maestros or maestri) is an honorific title
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 0xe7c7620bd20bd1247ee900884615679aa83e1c365073a9dd518e4c03a2e199cd. Chain 2 (Bitcoin): anchored in block 953791 (2026-06-15T13:40:30Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e05693a2-8515-4525-9dbc-a2e768f1b4a6.json and https://artists.proofprofile.net/proofs/artist/e05693a2-8515-4525-9dbc-a2e768f1b4a6.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 0x691accc6fed016551506be9e33f9817c0737b80e4fb8f8ba3f65a25a2b157886. Chain 2 (Bitcoin): anchored in block 958601 (2026-07-18T19:27:02Z), 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/QZGWX2120240.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1271022d8befaf6a27ddba4f4b952f79838e002a6cbbede0dd99cd1fbb1bf4e5. Chain 2 (Bitcoin): anchored in block 958256 (2026-07-16T07:22:18Z), 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/QZGWX2120241.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00b6c69c91b2b395ff747fc7a6dc5756f8afb2e065f6a50a1b3f7a4003e25947. Chain 2 (Bitcoin): anchored in block 958802 (2026-07-20T01:04:02Z), 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/QZGWX2120243.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d7aa839ba3f416ec7072e8effdc52169f9784f46bd047c182315e4fc780f4c6. Chain 2 (Bitcoin): anchored in block 958943 (2026-07-21T00:27:37Z), 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/QZGWX2120244.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b7090a801d327c160504fb0617b72f741dd7fa46385b778c187a2149f6f7c86. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QZGWX2120247.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfefc95858b53d76dd91b0411045d5456f97af5d6ce5a219d3cb74f7672b87038. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/QZGWX2120250.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb13be6838ba5c3736d8680bc6a166c38e606e248ba2e33cffe51a3997cd638c0. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QZGWX2120251.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e1a73a84c9c9fd60006388353750fdbf2bb8d6f69d0c5142ec9ee41045ed7a6. Chain 2 (Bitcoin): anchored in block 958878 (2026-07-20T15:05:26Z), 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/QZGWX2120253.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6042794c69bfc05e51cdb22fee29ca559dfafd0e0f9d5a982a7f69942a9795ba. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/QZGWX2120254.