Mark Anthony Contreras (born January 24, 1995) is an American professional baseball outfielder for the Staten Island FerryHawks of the Atlantic League of Professional Baseball. Contreras played colleg
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 0x36bca3cace83101937b64fd2163e02bd14ce3326aa9b92c0e728e6dbb037450e. Chain 2 (Bitcoin): anchored in block 953638 (2026-06-14T13:10:39Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/393f3b2f-1262-4c83-880f-244a68f73b90.json and https://artists.proofprofile.net/proofs/artist/393f3b2f-1262-4c83-880f-244a68f73b90.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 0x11d4c1f7ab40cac23a0f74bdae687824ef6fa9a3febe02d1d81ec2c28a930826. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QZWFR2470850.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23c21ad60f75dc3fe7b9f926408aec406b180ada51249b9c2f7f6a46efeea294. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QZWFR2470851.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e1aae6a6481e54fa78030ade5738654ce0826ff8bf2b8619c8e9a50e29fc518. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QZWFR2470852.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfdf8e56365ea16568dd957458aff3556e0a6b8a1f4d3c5ddecb4386aaac6c0d8. Chain 2 (Bitcoin): anchored in block 958690 (2026-07-19T07:14:39Z), 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/QZWFR2470853.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8dfcc131c4ab79af36b28add2dbff7277a777bab9de42a9dc15ed9d23f8b9ee9. Chain 2 (Bitcoin): anchored in block 958601 (2026-07-18T19:27:02Z), 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/QZWFR2470854.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd00d7e321f8ad75510065b195a71b01a38e9de94f638f2e3159f4f78288635c. Chain 2 (Bitcoin): anchored in block 958621 (2026-07-18T22:59:44Z), 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/QZWFR2470855.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8210ecffe1c815ad9534633702eb15adebb64f4320971cdd3c73bcf4eb61641. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QZWFR2470856.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1ddb4709dfbc6f206e21f3743477dcdf2ce0f779e439795bdd22f45df969eda. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QZWFL2587675.