Manuel Freire (Manuel Augusto Coentro de Pinho Freire) is a Portuguese influential left-wing singer and composer, although he also works as a computer technician. Freire was born in Vagos, Aveiro Dist
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 0x340e5cef25610822cdc65cc99122dc937dba1a4becd980df5baa54d7efd4a122. Chain 2 (Bitcoin): anchored in block 953408 (2026-06-12T19:28:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/723b6424-80ee-4dbc-91c9-ef32b79dd883.json and https://artists.proofprofile.net/proofs/artist/723b6424-80ee-4dbc-91c9-ef32b79dd883.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Canta Versos Diversos de Vitorino Nemésio
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 0x4954f3fc067e8ba9a69870c195a71c0c8026c5f05219e597d5b5d393e3ce5f54. 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/PT2EO9300150.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71adf291ec94b3d0b3f04471da4a47dbb8e9a6f5fc72fe9b6c5cf2bd88081a3f. 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/PT2EO9300151.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50ce7570f288dbb9172a68520d178a454da9d80efddc6608799f8a5a672c407c. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/PT2EO9300153.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9bf3d5546192bb75bb974d6c75f2f0663bbfe30c79ee7ea3b1973fd3359494e2. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/PT2EO9300160.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec6170e8198bc79c8cf72bab6ce18d5583b407b1d926737b591f5b2a9bdf8d43. 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/PT2EO9300154.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3625f69c818546982a8f9f2320031c4c1451cb2d1c238ef3e9693afba7ca07ee. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/PT2EO9300157.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e04bd66ebe5e3c812dc108144674ed29d1cc36523a0b04bcb01356050bb535c. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/PT2EO9300159.
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 0x2e861387f39279bd444e2a34247443cc6b6510b6253d984c28585d1abcf19e93. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/PT2EO9300155.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd928e6ddce690c917941f51ab55df5e7e284acc93263908918e1abe3e3bbe531. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/PT2EO9300161.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39fd4c6ee24a8b9d9ba21277360737ab0cb1cf22fefa7c833394a1faf5268f13. Chain 2 (Bitcoin): anchored in block 960506 (2026-08-01T03:50:58Z), 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/PT2EO9300156.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88eca36f030bab51ba432d14ef2a56638ec8883f8ed22a61692808059d8cb547. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/PT2EO9300152.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb353e9c7142ccc5470a11d368a09d97eeb18b0deb75e3b12dcfa362aee1bcf01. Chain 2 (Bitcoin): anchored in block 960095 (2026-07-29T11:07:37Z), 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/PT2EO9300158.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92f4ed7fda0132bc2ce10c0eb0d36e4ad9d2200197a70add2ec6563ed4fda5f1. 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/PT2EO0700313.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30bd73ed49a449992d214558320161434d4fc613578286c5506ec52c37c39aa8. 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/PT2EO1400004.