right|thumb|The mounted archer represented the quintessential samurai. The were members of the professional warrior class in pre-industrial Japan, who served as retainers to the lords. These men came
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 0xdc260f78f71c5ddbda9ed9332fb37688c34c836e0196e0c213a7aa3d2df76382. Chain 2 (Bitcoin): anchored in block 953423 (2026-06-12T21:20:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/5b0b1259-4511-4708-b59d-3a0214cd6f86.json and https://artists.proofprofile.net/proofs/artist/5b0b1259-4511-4708-b59d-3a0214cd6f86.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 0x7913359db74b46c1fe9907615991bcfba884179569c11f35e0f03cb65389b07f. Chain 2 (Bitcoin): anchored in block 956578 (2026-07-04T02:23:20Z), 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/US7VG1744540.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9994cda723e4e2111d1e6bfd7160b5abc24b3be2360b003a7361a19b205e5c02. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/US7VG1744591.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67631d4e619194f1d1b5c59b2328a8212b2b02868952f43f0b6b62cdb89800c3. 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/US7VG1744592.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe5e038c21f9b0253cecf2ee9b9a4a33964d7be5b9861b449fdcfcf0b78ab6d5. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/US7VG1744593.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7a9ba0a7d024642b2668059de1a0d6ba54e1f7978c6f7ecc39f5cfa375fe56a. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/US7VG1744594.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x394672699dc8019a4ff323bc13d9c2b3f2a33627fcd9d896bc5643b23b841301. 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/US7VG1744595.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa0653263c08055e5a8659557b07b45210dca7c35b7941699a81a1594d6756aa. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/US7VG1744596.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9565c2910b35e141d103f974baeea4abaf3795033b415a5c6c921401262bb0ee. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/US7VG1744597.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61eb513923dcfd15607e283cc66684bdfa280d555e2f6347c1f0df73a5d62efd. Chain 2 (Bitcoin): anchored in block 956857 (2026-07-06T01:26:17Z), 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/US7VG1744598.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3692636b92c72b28103703d8b2f81d94097fec4ee0a3cc5084241ee2fb72d47. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/US7VG1744610.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5296eed84811d13f47b5131528c72154e3e9b70f1ba6a1366e65b0ad81d5edb. Chain 2 (Bitcoin): anchored in block 956841 (2026-07-05T22:14:35Z), 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/US7VG1744616.
Quem É Quem (feat. Miguel Neto, Big Nelo, Gangsta, Samurai, Kool Klever e Irina)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcba182d87f8a9a8b0cc7916104d1cd744bc1e6777e583265e1154a5d0c6537f7. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/PT4CA1433944.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c78cb0193c66060b641d40930fda44a4450d2a555d40d8740dae6f43d985dad. Chain 2 (Bitcoin): anchored in block 960379 (2026-07-31T09:25:34Z), 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/US7VG1745747.
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