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 0x558e8c03e62352d8630e1269191320eef6f9846ba5a0f28c94a81bacb2b1ef60. 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/f7a733f8-2e6f-4ee1-8c61-60a9fcbb0e3a.json and https://artists.proofprofile.net/proofs/artist/f7a733f8-2e6f-4ee1-8c61-60a9fcbb0e3a.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Towner, R.: Guitar Suite / D' Angelo, N.: Electric Suite / Sidney, A.: Changing Shadow / Little David / Piazzolla, A.: Histoire Du Tango
7 Spanish songs (7 Canciones Sefaradies): No. 1. Abraham Avinu
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 0x5c8300ee1aa36c1e29afb040a48e4421059d024ecebf129fb5fa524a013a0698. 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/GBCKG0701444.
7 Spanish songs (7 Canciones Sefaradies): No. 2. Ya viene el cativo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71659e1dad2dc425911a615130b33bad1862c10e81c55fd908c0363b85dd11dd. 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/GBCKG0701445.
7 Spanish songs (7 Canciones Sefaradies): No. 3. En la mar ay una torre
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6caf0108e7414cafb5233503d5eb9e5b55e2eb4a8bc51e1cc5ed5b50ddc25947. 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/GBCKG0701446.
7 Spanish songs (7 Canciones Sefaradies): No. 4. A la nana
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd61032a2808a8294b077fd6c912e0f3396b68aaa2b5336d6bd601ecf7200941f. 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/GBCKG0701447.
7 Spanish songs (7 Canciones Sefaradies): No. 7. Noches, noches …
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ed882d6f0127381ce396ab1b8e00b012deedac1092e83b07de6e2bd860b5ec0. 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/GBCKG0701450.
7 Spanish songs (7 Canciones Sefaradies): No. 2, Ya viene el cativo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71659e1dad2dc425911a615130b33bad1862c10e81c55fd908c0363b85dd11dd. 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/GBCKG0701445.
7 Spanish songs (7 Canciones Sefaradies): No. 3, En la mar ay una torre
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6caf0108e7414cafb5233503d5eb9e5b55e2eb4a8bc51e1cc5ed5b50ddc25947. 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/GBCKG0701446.
Canciones Sefardíes y Danza Judia para Guitarra
Crossing Over, Towner, D'Angelo, Sidney, Piazzolla
Flavio Cucchi Plays Barrios and Villa-Lobos
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x417a8578f346402e352b4ad18db3032632015767e4e4e58b1a75738c92a1d397. 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/GBCKG1000323.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe431a866f4789fa9a75949562452443a85032bafc45918c00c795d86b6aca5e7. 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/GBCKG1000326.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4bbed9d8569b66452e4c36bb82bbde3e85a340ccbcf6c2e4d850daa6179af2c9. 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/GBCKG1000332.
Suite per Flavio: I. Le campanelle in letizia
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3a76c04e0bcd6870c5b0d6e25d26eaeb0b2b95f28d19ff041cb53b01b6de84c. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T10:20:17Z), 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/GBCKG1000335.
Flavio Cucchi: from Dowland to Chick Corea
Flavio Cucchi plays Latin American Guitar Masterpieces
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b954eae5d13557917d4ab19a8f4b3b6ee1cc6500bbc62422156fe7b3c378351. Chain 2 (Bitcoin): anchored in block 956637 (2026-07-04T10:56:23Z), 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/GBCKG1300240.
Chick Corea: Children's Songs & Ruminations
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3fd44cda95daee76551b81ed7911b8aaaae69e6fe2959d56eea09b438a3a6d7b. 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/GBCKG0600958.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1c69666b12e9d17c9133db414f6068de789feef9f0ab697905c84e9c64149b8. Chain 2 (Bitcoin): anchored in block 960187 (2026-07-30T01:34:28Z), 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/GBCKG0600964.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89056f6469548c747f2fa5ca0dcfd068bc6bf450bbb646639505763df08df2c2. Chain 2 (Bitcoin): anchored in block 957041 (2026-07-07T13:25:45Z), 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/GBCKG0600966.