Diego Figueiredo (born 23 July, 1980) is a Grammy-nominated Brazilian jazz guitarist. Biography Figueiredo began playing music at a young age, going through a number of different instruments before
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 0xc29c6c8cdcc06c7f9d2410ce0a9f27cab63cf47a248c1afacd4d360b09bf9b05. 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/afdfd275-990a-4a99-8ce4-b6e093584e54.json and https://artists.proofprofile.net/proofs/artist/afdfd275-990a-4a99-8ce4-b6e093584e54.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 0xa215b457d346c3198fada755b08c82cddfc28213db93cca798e3b46f12aa4a4b. 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/USASD2000145.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6197ca11e6308b5f3bd8fc67178cc93d3e5cfffd8513699ac2ef7494765ac758. 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/BRTRB1871513.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x196b403d0a21495a4d5faf3a31cff1c3dc5d3c603cb096cf2974c79b075dc35d. 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/BRTRB1871515.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0dcf9a43019bb2dbcf21acb90128aab81187762b06e7db493cf029def3ecfaa. 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/DKBDB1502701.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b5eb5149a9b69c344da0d785976c9016705eeb9f7d77b641ba626ed3ea85e7c. 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/JPI291170501.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe85db2454625105d6a48649fb555b800bb205ae1eddd910e5ef5dd90c7df91fa. 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/JPI291170502.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51043220c39a9e185335758444ff747130165ed79f4553c3b5063d40839c2391. 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/JPI291170503.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83348930c66fc79ea656599fc2e60df06f46548c2357e3132febb5707ead3fee. 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/JPI291170504.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1785ebfc13f9a3941cdd16c223b136d2246267116cedc3a080f3c2b6d486ca01. 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/JPI291170505.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c183f65fc69eea1dd5c881bc5b861ac0375f2c2744f836b1ee924f2d7ed8c3f. 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/JPI291170506.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ba1db3ae482cd2ebdd148eb702217ebaaed04ded536a57f874ec05cd534f678. 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/JPI291170507.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeef5fddbdb29f70fc11661f7559d5e50bb9e3b1f3cda6b11d8ed92d2cc6b914e. 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/JPI291170508.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x502cf4ea2b6f1fd2daf8c318944995448cabd5e23d2db8921f54ea7cfcaa0725. 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/JPI291170509.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a84e8447d75ba32be097db198c0c3b84e4637998e93ca6c6d9e632c5ff822c6. 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/JPI291170510.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1bf7ddeb5b920a4a81df65f056fd4ea2a1d2b33b35a1a4db5c767b4af4a12e3. 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/JPI291170511.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeac38eaae4f5af28408a30e825bfec51a31d4c6e6ae59ebedbfaa27e3a7e6048. 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/JPI291170512.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x184b1a159052b06d5515a3f388cc00817df84ac7af4c9444206a88209f6c0984. 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/USHM22423290.