Juan Chavez (1965 – September 9, 1999) was a Mexican serial killer who, between 1986 and 1990, killed at least six gay men in three cities in Los Angeles County, California. In 1999, he was sentenced
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 0x1ffc59dec8e185e84246814d3df5eccbc1c60535cb285c33b68850bc0f4b68bb. Chain 2 (Bitcoin): anchored in block 953678 (2026-06-14T19:23:11Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/632f4928-d6ee-4d9d-a09a-567fb7507fbd.json and https://artists.proofprofile.net/proofs/artist/632f4928-d6ee-4d9d-a09a-567fb7507fbd.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 0x765d93c7ca08e7f843191a6dcd79d6797a0d0ef12b0a88d0fd01f05c176b5bf7. 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/FR2X41603123.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8235d1ccb014b03c9fec67d50c4ef92629c8ee52ab0a3de0e4c23e488ffaa5b9. 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/FR2X41603124.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33975420501f790e40a6758378c8c1c58e859044db6c0e6ab9c9a297e6714c82. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/FR2X41603125.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x281eb397ada66fa959ca52e5897e4f66b862d0cb5caecc2992d4f231f5d6cf32. 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/FR2X41603126.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a684f174936595046becd4f4eed4ea5b86be92bbacee0523ce664e54bcd6e8c. 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/FR2X41603127.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc27e28e1dfceaf0361dc2f268df7542ac039cca4706fbb1e4c8ac172ebbae63. 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/FR2X41603128.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4356d0d61be62bf3389f6938bc237abe159e002eb16999783aa09d873e88d5dd. 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/FR2X41603129.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31d23e929b6b91de7aaa220ebdda2b821f0d7fd62e4b693848b96399f0083d34. 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/FR2X41603130.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53e6706c497a2a077584f2c5dc6113dfd7d8a430363e8f04e3a13c6eb030b09a. 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/FR2X41603131.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8768c42211fe2dc7a33aa72ed55de28daba1dd065689643e11c49da4d85bf7b9. 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/FR2X41603132.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xabea4d3f8a4edc8f1fe9cc5bbb9ea4a958e6b37f999d77e7a7936edf14ae05e2. 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/FR2X41603133.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80b5063574819efe496f5cf2b1611db3ccb4e6ed8f66cd0bf4d6d8ee083b120f. 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/FR2X41603134.