José Manuel Cerqueira Afonso dos Santos (2 August 1929 – 23 February 1987), known professionally as José Afonso and also popularly known as Zeca Afonso, was a Portuguese singer-songwriter. He is widel
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 0xf510228b4fe1b5cd29934b5358fb561360638098cd839d3fe95729ec3b19dc63. 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/733cb8d4-2fe4-4b82-a9da-9afc44b9852b.json and https://artists.proofprofile.net/proofs/artist/733cb8d4-2fe4-4b82-a9da-9afc44b9852b.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 0x57dbb0140c44c6cb910391e78c1bcfed76fcbc4d90f9d0fbdf814324baa276fa. 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/PTEM19400154.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1bf7ab2a7ad50a5628cc136c84d0a16e4ae2a0bcb67599db29f4c6bf6f0aecf1. 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/PTEM19400156.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25c6b30e386eaa547d9a40ee1b97b7c351b8da38ea478fbb078a8fcc194bfa53. 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/PTEM19400159.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe82410fc5dc431bded9d287416d222bd280b5b0604ecff3256233e31d65aa917. 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/PT7CG2200606.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x696145d4ee6020f4061f1956ea82bdcf846d6edb12c611256ec776bdb992d182. 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/PT7CG2200595.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e4bea1627637d7ffb99281a15d18e902a4974102573a11d5f6a169f967e356a. 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/PT7CG2100570.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a0dab28c1d84de0ad6b37b68eddba0ebfdc3c363681d6a9c25f2a6156579c8e. 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/PT7CG2100571.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf32dfe692b8280a3b92feb42297e34bf4a10b1ee0590bddbab5d65ff2d303989. 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/PT7CG2100524.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x127fc0336f75faa236d89022a2b061b88663c560efbef6d09554bf693e2134c0. 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/PT7CG2100525.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a4a24f0ea22717e472280dfadd52126becdcb94bc1464a01838587cfdf88b69. 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/PT7CG2100526.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a459fc9f2633eff0562899fe08f866f91b6ff48142fcb4104a082ae3876c631. 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/PT7CG2100477.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x012787fa0afbc3f87dfd9fbd5c79fcfac83b2b722b53600a0b7d76afc09a5107. 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/PT7CG2100528.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c91be2b0548fddaaf0d4122924dad251243e31b424bafa9285163e7ef328815. 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/PT7CG2100512.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f244bae419f7840afae7788155f43bd90cb61310e061e71e6cfc39690643d8c. 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/PT7CG2100513.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x988daf0ea8e39bea94172c57d508434f66278c358017cdbd42f81222fc4720cb. 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/PT7CG2100520.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08a338015e3af3ced6978c750551b94e00f43e0c228cd7939fc7a95b7d782430. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/PT7CG2100499.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a459fc9f2633eff0562899fe08f866f91b6ff48142fcb4104a082ae3876c631. 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/PT7CG2100477.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b8749220043dc5a860c27f5b49dbaef40d0a4163360bcaa3ea1e01595a6ccf8. 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/FRZ390400250.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfbc3c4ccc49128a182b789af3235dbd8fafabef854d2ef33170547ede1fa961f. 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/FRZ390400260.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb46a802d7a59cc88859584397228aaa079fbebc409cce7c8cee8339eb72afaba. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-22T01:17:10Z), 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/PT7CG2300649.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e4bea1627637d7ffb99281a15d18e902a4974102573a11d5f6a169f967e356a. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/PT7CG2100570.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a0dab28c1d84de0ad6b37b68eddba0ebfdc3c363681d6a9c25f2a6156579c8e. 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/PT7CG2100571.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x846c2003817ceaf7caf5476df03147adeab98f414677e814b96106f76970b2f3. 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/PT7CG2500971.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe82410fc5dc431bded9d287416d222bd280b5b0604ecff3256233e31d65aa917. 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/PT7CG2200606.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x696145d4ee6020f4061f1956ea82bdcf846d6edb12c611256ec776bdb992d182. 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/PT7CG2200595.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf32dfe692b8280a3b92feb42297e34bf4a10b1ee0590bddbab5d65ff2d303989. 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/PT7CG2100524.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x127fc0336f75faa236d89022a2b061b88663c560efbef6d09554bf693e2134c0. 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/PT7CG2100525.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a4a24f0ea22717e472280dfadd52126becdcb94bc1464a01838587cfdf88b69. Chain 2 (Bitcoin): anchored in block 954130 (2026-06-17T19:07:14Z), 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/PT7CG2100526.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a459fc9f2633eff0562899fe08f866f91b6ff48142fcb4104a082ae3876c631. 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/PT7CG2100477.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x012787fa0afbc3f87dfd9fbd5c79fcfac83b2b722b53600a0b7d76afc09a5107. 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/PT7CG2100528.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x988daf0ea8e39bea94172c57d508434f66278c358017cdbd42f81222fc4720cb. 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/PT7CG2100520.