Marisa dos Reis Nunes (born 16 December 1973), known professionally as Mariza (), is a Portuguese fado singer. Mariza was born in Lourenço Marques, Portuguese Mozambique, to a Portuguese father, J
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 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 0x603d5441425863626984eff3855b586762222ca7f7b88b69485d3d33fcd4946d. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/9f8d5c6a-08e0-4667-8fa4-6252a1b10818.json and https://artists.proofprofile.net/proofs/artist/9f8d5c6a-08e0-4667-8fa4-6252a1b10818.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 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 0xa104c15670d69f7c64402bbd18ed6d4a9cec420530d1996cb029184545cd8e3f. 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/PT4EG1800001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10c67a6be188fc8b6ee25477272910c8ef558fd665f923abf0263b3e93d6a530. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/PT4EG1800002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb7c6929cef8170fda3ec9994484c357e7945a438e56656820197d1b93c9a19e. 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/PT4EG1800003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79d9490c1532446df7c7f070eb7e311744cb86b89ac67bd2f971a88e038ae7a9. 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/PT4EG1800004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64b336e3f154b1b462736b6df86260a2adc5f3c4d04aad5e5d5f148f7d6c1f0e. 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/PT4EG1800005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0474ebd582a3eec4e0d1ae7297f4ae2dc2049a9e69dbc9db0762fe8301fa4f6d. 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/PT4EG1800006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe25daeaba630ac2a94e9478d13a200eb64d28128d62b4b11865726704cd9343. 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/PT4EG1800007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19d8b00c6316ea4f7ee9c351d783bff3d002ca2c4fccc0816feac9835bacb575. 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/PT4EG1800008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x134b18b8bf0740151950a4364b97cc907815ad6ab291699e3502920c1bdbe535. 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/PT4EG1800009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91dbf1a3cfdbeb17c22e9c82c917895245dab9c84f866f6ab88a079d58aba701. 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/PT4EG1800010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36e1bf392cdfa595c65108f613a77b883f38a333ce1f2610ab6bf35cba2d4007. 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/PT4EG1800011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb31b664043aec0bb1fd59baa55fa9294448425a108a24c17e313bfad743555e8. 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/PT4EG1800012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a2210482db977403c5e707f6e79def42e90672929235fc49426c876870c0711. 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/PT4EG1800013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc11df47ea8931f1117a933f7efc1ee8316d7d7f9fab04d6c24571cf978006284. 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/PT4EG1800014.
Trigueirinha (feat. Carolina Deslandes, Jorge Palma, Mafalda Veiga, Marisa Liz, Ricardo Ribeiro & Tim)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd13694760cf1b3e440531065c83e2773527b654c142f78a1332ae32cec267fe8. 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/PT4EG1800015.