Sylvia Regina Rexach González (January 22, 1922 – October 20, 1961) was a Puerto Rican comedy scriptwriter, poet, singer and composer of boleros. Early years Rexach was born and raised in Santurce, P
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 0x66e4514cafeeda2f831b156d96fa1ddb4e52241fad1110e644d90650684c2dce. Chain 2 (Bitcoin): anchored in block 953704 (2026-06-14T22:58:38Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/78102db9-7e9c-485e-a73e-f3585df8ee6f.json and https://artists.proofprofile.net/proofs/artist/78102db9-7e9c-485e-a73e-f3585df8ee6f.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 0x7e85e7be14f63db4a2ad2235f2cdab1886d03c1f59142bf051580acf6cd043f1. Chain 2 (Bitcoin): anchored in block 958733 (2026-07-19T12:51:21Z), 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/QZ9WY1701068.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x989521acbf9ed67e08f147abafa912af367aa518952b5f9bd34e36f815b771e6. Chain 2 (Bitcoin): anchored in block 958901 (2026-07-20T17:34:53Z), 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/QZ9WY1701069.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6cd5fc6c197186a2a6e3b9ab6c33e2b50fadccd3da3edb639fe924741add699. 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/QZ9WY1701073.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde3be6a13240ca5f8cfd9b01127f82f99b808b791856bf23096a1a464079fee4. Chain 2 (Bitcoin): anchored in block 956738 (2026-07-05T04:47:21Z), 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/QZ9WY1701080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90ad6056f3cdc97679f90d25f153de7c80fbb425eb484908e6291668d3ccbf3c. Chain 2 (Bitcoin): anchored in block 956656 (2026-07-04T14:03:39Z), 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/QZ9WY1701081.