Marco Rizo Ayala (November 30, 1920 – September 8, 1998) was a Cuban and American pianist, composer, and arranger. He mastered the 19th century works of composers Manuel Saumell and Ignacio Cervantes.
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 0x62674ed8fa6015f7c02029bcba50141468c9c9bd01e434c988cb25120b678bcd. Chain 2 (Bitcoin): anchored in block 953660 (2026-06-14T17:20:01Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/532cb34b-ada9-40df-840c-8c1b139ae64e.json and https://artists.proofprofile.net/proofs/artist/532cb34b-ada9-40df-840c-8c1b139ae64e.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Bossa Nova: Brazilian Jazz (Remastered from the Original Somerset Tapes)
Bossa Nova - Brazilian Jazz (Remastered from the Original Somerset Tapes)
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 0xb54b46c752218a34bbeeafa0484937e2da98b28b43504413430cec587fab2889. Chain 2 (Bitcoin): anchored in block 958058 (2026-07-14T20:20:34Z), 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/CAM460804048.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50f1b2d6a6291013ca556e11170fa9709bff6efa3c33983c1a2b489c48b87c7f. Chain 2 (Bitcoin): anchored in block 958448 (2026-07-17T19:49:21Z), 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/CAM460804052.
Lecuona: A Musical Legacy (Instrumental)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x137fc3649f72602351f228a9eeff2a2853a5f6df80944d8a5407100e3d34c395. Chain 2 (Bitcoin): anchored in block 956349 (2026-07-02T11:34:59Z), 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/CAM460804051.