Harold Henry Mattox, better known by his stage name Matt Mattox, (August 16, 1921 – February 18, 2013) was an American dancer, choreographer, and dance educator. Born in Tulsa, Oklahoma, he moved with
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 0x8ad51a97a6be65221fd2ca74e339969260ed1923fe3a2ba0fae0183ab10d2925. Chain 2 (Bitcoin): anchored in block 953423 (2026-06-12T21:20:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/7b2fbd0b-c713-47f2-85d2-0d5ef6e39ccb.json and https://artists.proofprofile.net/proofs/artist/7b2fbd0b-c713-47f2-85d2-0d5ef6e39ccb.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Seven Brides For Seven Brothers (Original Motion Picture Soundtrack) [Deluxe Version]
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 0x4b35bda2738092cd86629732834e8681b931fecd3b5cc01ca453c3964665df93. 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/USNLR1701188.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9810eca08824777a0e9050360942b64e2eb168c043752775da12ec57ec0beded. 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/USNLR1701193.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24f06aaba024f62342052056607a6d91e4a8a76334f276778466f072057f0e63. 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/USNLR1701195.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae50dd24c46cdd3c2b8bb5ad159fc176d5e7b93b5c52ced34b59c512d88b3e44. 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/USNLR1701199.