João Martins is the name of: João Baptista Martins (1927–1993), Portuguese football forward João Carlos Martins (born 1940), Brazilian classical pianist João Paulo Neto Martins (born 1988), Portugues
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 0x41a3d5e47d73a75590f68ef527c3d6dfd57463e565b94f639c2a56ac9b0b68e9. Chain 2 (Bitcoin): anchored in block 954516 (2026-06-20T07:04:44Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a2db8f9c-7614-49f6-be31-8bdbe145843a.json and https://artists.proofprofile.net/proofs/artist/a2db8f9c-7614-49f6-be31-8bdbe145843a.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
João Martins Ensemble e Miguel Araújo, ao vivo na escola de Artes e Ofícios de Ovar
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 0x9d04177e0105c0d8ab004798e03c9afd65eb4a452575da33ed6aa9771d47b09f. Chain 2 (Bitcoin): anchored in block 957061 (2026-07-21T21:47:38Z), 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/PT4CG2300010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ac551e5c4f380c62c291bf66c574948b564749e8d13dc775eddbb7c00b0577b. Chain 2 (Bitcoin): anchored in block 957061 (2026-07-07T16:07:00Z), 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/PT4CG2300011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdfd7bab36f789579f43116293ee2a0bcd6f65b24b2eb0340a152575503ba1a6c. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/PT4CG2300015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ac551e5c4f380c62c291bf66c574948b564749e8d13dc775eddbb7c00b0577b. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/PT4CG2300011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbad0e41f399ca23e0f3ac4a8a34cb421d6f66ef5cdd9768c1cc0ef71e7e61d06. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/PT4CG2300012.
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 0x7051f77a5627d4aef7fc4bf0c5e90d93863e5ae5c360a6efd25506e5ee1869de. Chain 2 (Bitcoin): anchored in block 960212 (2026-07-30T05:43:45Z), 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/PT4CG2300013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe832483f9176edf8d51d9164085711905b1855b672d5654a3820457ef0f57f74. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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/PT4CG2300014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8d6b392f225c7da0dbe9df5317d24ba7a4cb48d6e7992651685c88968ec5ffe. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/PT4CG2300016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd77deff038b4465d9378af3ba827b5652c1ac8772afeafa12b078683dc4c8283. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/QZTB42385433.