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 0x2755ff284a68a87597cd91654e364edc87b90ce527422f235dfd3586d13a3e6f. 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/4dbaa0b9-3714-4e28-84b7-086c03d90fad.json and https://artists.proofprofile.net/proofs/artist/4dbaa0b9-3714-4e28-84b7-086c03d90fad.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Guilller: In Memoriam (1942 - 2021) [El Rey de las Cantinas]
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 0x1f76ee190e15a531de5f04312826b02be826472ef4c4f24c8173607aeb619ca0. 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/PEMG98101005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8bb9905eef9e2ef58ac9c0bbf41ad7b631558aa8570dc59e63ff9cac2f60239d. 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/PEMG98101006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8dba99ebcbf3449568bdceb1217b4b778b3304fe67dfab26a704f22217bd413. Chain 2 (Bitcoin): anchored in block 958853 (2026-07-20T09:11:53Z), 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/PEMG98101010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e889a56758e1f71a6b72f710bb0247b46f39227dbc0474511086a0e69534552. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/FR96X1666606.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d98dcb1250c0ce918fad47bf5fa81215ea52462fc364c7dc43a803e8caf3453. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QM4TW2446884.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89cd949dd27ee8f25cff0c9742d5e13cfa8f995e3348577269bd34efc3f5df4b. Chain 2 (Bitcoin): anchored in block 958650 (2026-07-19T03:36:41Z), 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/QM4TW2446885.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7b2ea2e66846b666e4d81270c7b2fa1ccb13ea951a7cad8e6c488abdfdb1eab. Chain 2 (Bitcoin): anchored in block 958977 (2026-07-21T06:27:23Z), 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/QM4TW2446900.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41a7101c57910d21b0272e376a00967e41f0bbbd7c84f35a2d305f433a22971c. Chain 2 (Bitcoin): anchored in block 958853 (2026-07-20T09:11:53Z), 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/QM4TW2446903.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x043f7e8abdd11c5e753290e75a1b4f5ae30b570355df48783a80ff89c47f582f. Chain 2 (Bitcoin): anchored in block 958975 (2026-07-21T06:12:52Z), 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/QM4TW2446909.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab669a1ae79e2dcf4562d291f26c70fffe8d7ce37a1028c0a4258dafb0795ea4. 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/PEMG99824003.
El rey de las cantinas. Boleros cantineros
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08d95842b5d8e30c16cbe027edb6802d5b20e56df7086aa446804e06f731523d. 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/US3DF2194275.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc95031f6204e9fc6978b944f58e9d9141dfa82ddc3b45609cbf7fb440f1f27d. Chain 2 (Bitcoin): anchored in block 959008 (2026-07-21T13:14:05Z), 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/US3DF2194276.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3580f511ee33b754517f6437297f3b040e99fce8de45f2bf3a364a03b73f9ec7. 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/US3DF2194277.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78258f9b7470d6029b0ff23bd83f9e131fbcc0cb2cb1c867168b5e4b4c66ba3a. Chain 2 (Bitcoin): anchored in block 959076 (2026-07-21T23:41:40Z), 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/US3DF2194280.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9f402713d6f449615eb0b79adb02a10125a62674f675730bf49bb86350cc5a7. Chain 2 (Bitcoin): anchored in block 959065 (2026-07-21T22:00:50Z), 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/US3DF2194287.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14807b980261894adfe3b06b5e94c6a7145c8ac421c24c5e8bcad068d173a8fe. Chain 2 (Bitcoin): anchored in block 958980 (2026-07-21T07:04:12Z), 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/US3DF2194298.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f799df197f366a867d0d1d87699899390fa4296bea00491bd0f7b56b7272bca. Chain 2 (Bitcoin): anchored in block 959137 (2026-07-22T14:03:35Z), 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/QZWDW2511377.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78ec5da0d9e31b8186fd229f3951b4662b6f221b43f3ca75a41ceaea936162c3. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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/QZWDW2511379.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfbfa5e19d71eb9fe8f0a4b2f1e1aa952fcc75e4c25e42f50f438cf3242e67b15. Chain 2 (Bitcoin): anchored in block 958596 (2026-07-18T18:42:38Z), 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/QZWDW2511380.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b6f1f0e93a7455fccd355d31abddb5412a234e1d719d2207afd49b6386d4bc0. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QZWDW2511381.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9cf3faabad577f799f3b2c2c8cfc2c26a466a9550079daf599053786faecf7a. Chain 2 (Bitcoin): anchored in block 958920 (2026-07-20T18:14:22Z), 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/QZWDW2511382.