Juan Casado Fisac (born December 18, 1998), known professionally as Ralphie Choo, is a Spanish singer-songwriter and producer. Early life Fisac was born in Madrid. He grew up in Daimiel, a small to
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 0x53ba26be7f35bcb711cf1ad0f8a3149a452fcb802d41dc5942da2bb659dee9ed. 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/f814b87b-2497-4021-be7c-0d6ffa27985b.json and https://artists.proofprofile.net/proofs/artist/f814b87b-2497-4021-be7c-0d6ffa27985b.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 0x3096a807db896ea239f1a90797c1007cae5aaea1a5921df08a79c6680918d84a. 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/USWB12303036.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8630f271190bf777dffdbf8d4c5e69b44f739a5e9338ef9caf81671e9040a896. 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/GBLFP2046032.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0dc376ab1ba7dc17f6bcc592e7fce333d60f713f7df53bef56098f04d6f30a4a. 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/QM6N22309333.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ffa185d47ceead25c7812a083feb7e72fd8bb91e359d6e58a1573046ab47821. 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/QM6N22309341.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd81146b3fe331e3596376e1e9beff22b1245a9097695c655e34e2b40adaa640c. 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/SE2XW2300203.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4101e8beb860888ad8935f39a129b2ba5196933e593c7633c4ae2d026406468. 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/ES71G2057971.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14a164a8d82259c418a31a87b15c44ba2375874690f924bde0dbcf7859553b23. 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/GBLFP2045238.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x350b1363fd0ff538ba0d379b2bb34010f0b0714ca12c6ecc45962174ef46faa0. 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/BK4DA2501699.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa1d4e625a81fb5fbddc24ef840b3938998345fe47694773011517ce21098792. 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/USWB12303027.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84c866cf85739fbde339866468ea796a081249aea76c611c0d0b4320be0ff62e. 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/USA2P2227749.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8630f271190bf777dffdbf8d4c5e69b44f739a5e9338ef9caf81671e9040a896. 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/GBLFP2046032.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x889a58c962b8f4e9e88e6758de0fd4904e7bd7045f54502f0d538d76286ae765. 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/QZHN82014576.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x901d730f00f1fb4cd19bff6980936a4dab446b62d32338a8ced657a6e8b8726f. 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/USWB12303760.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7fd32dfb65def08e6ce32509c0c153b282b9bc4d3dc8460f92cec434da478d1f. 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/USWB12303765.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcedf7ff3fee79792595ce944e8f8c9692957552258e6c0c10d2d33adce23235a. 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/USA2P2242003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09961b0f6325a1f90d92e9815b9f1d9422ed68345431e32ffea558a0a91454f3. 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/USWB12303762.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa80a6336fb7a890e80dc856cd30fb56e2b452e5d61c241a16407d33c9ef6d2a5. 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/USWB12303763.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c7fefb915b786b27c225c0b70a7717d90b03e3b7db3e61715c40768d2494b15. 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/USWB12303770.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5822187a39bfdc33b4589c4b1adf7fb6fe30ac57b2d8f99786bfccf3c638b890. 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/USWB12303764.