Leonardo Rios Marques is a Brazilian singer songwriter, music producer, sound engineer and owner of the Ilha do Corvo studios, and is one of the founders of the La Femme Qui Roule. record label. He st
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 0x234dd2c0de7b6bd31a0b92b871a50bdbe8237d7a8a0b502c6424ca185ba2d8c0. Chain 2 (Bitcoin): anchored in block 953778 (2026-06-15T11:57:35Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d33b18d8-41fb-4346-9fef-a8edd338f039.json and https://artists.proofprofile.net/proofs/artist/d33b18d8-41fb-4346-9fef-a8edd338f039.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Curvas, Lados, Linhas Tortas, Sujas e Discretas
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 0x71a03225d76c90bcd36d8c7dc78d8050a6112f2547acf0a25f2dd703b285b113. Chain 2 (Bitcoin): anchored in block 958395 (2026-07-17T10:10:33Z), 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/BRLQ41800050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb4efd77e5cff5325b4da285a39b1591af4b4e34cd1b53a2231cfa6f4f2e62a6. Chain 2 (Bitcoin): anchored in block 958140 (2026-07-15T10:05:23Z), 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/BRLQ41800055.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d975968398784d23bc1aabb54790e5af505ace661aafba7b3a414f4f7dc0eb2. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/FR4EO2100016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69cdfbbd2e933059d83288ed1b8fb27777938761d4f647392a50b922098c24a5. 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/FR4EO2000063.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47d8376d31c59287f3c8b4fd9438cff5f06fb1fb29fe80b7bac00784b7ef1a45. Chain 2 (Bitcoin): anchored in block 959134 (2026-07-22T13:34:27Z), 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/FR4EO2000074.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9809ff77fc39507cd2b69b7181b49cbc146798db3cd065cc75c31345517c2107. 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/BRLQ42400003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2ac3b7267c967ca503fe6b072c27962fa53f4a96eadd2f35ebbc5889d4b75fb. Chain 2 (Bitcoin): anchored in block 960362 (2026-07-31T06:58:00Z), 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/BRLQ42400004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb52bb1e3f0b72f74b6b0834d0a1f7972767d499409ab0afb57a27b90da3f6c48. Chain 2 (Bitcoin): anchored in block 960193 (2026-07-30T02:05:19Z), 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/BRLQ42400005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4848fefcffbd5f7b0480f85e9f9fdb2324098b5505559d5085f14c8d6388dcd. 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/BRLQ42400006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe668f4193d9c21bdb9d44af6a1193fb6dc76317754e7d8089b203d125a329050. 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/BRLQ42400007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1d8b430e6773356644debfe18a303aef1f79919d11c7850a4775a69f7d75d7e. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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/BRLQ42400008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xedd083a1ccc3e3f8dc5b6b39bddbb408a678b036dc95b20fde71658b5b150a89. 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/BRLQ42400009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x943b8b08a1a93c9dd042252cdfc27317790d3d4a9fdebd339533c7c8c80e339e. Chain 2 (Bitcoin): anchored in block 959145 (2026-07-22T15:39:05Z), 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/BRLQ42400010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9d9ddce2e26507a3e58ea16a7f0387c7f5a57085105cd32cd31d6f511801ad2. 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/BRLQ42400011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1046859e69cfb95b07dcc5d319e58d51db11c70814690fcdb5b74099cbc107a. 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/BRLQ42400012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba91bcdbf67cb0da1decaaf19d2231ef74c9692675b63c429aa80ae4850d12a9. 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/BRLQ42400013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23cc616c694822345a45bc03013ca50a2f8a8dcfe383f7b013a7648741f1bee2. 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/BRLQ42400015.