Arnaldo Antunes (; born Arnaldo Augusto Nora Antunes Filho, 2 September 1960) is a Brazilian singer, writer, and composer. He was a member of the rock band Titãs, which he co-founded in 1982 and left
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 0x07e70ca012f2dcc9b6315fad494eaba531897fb89c6e70c2a347bd202b61dfb9. 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/b2a56b41-6aee-4b05-a785-a1ca19bd24f3.json and https://artists.proofprofile.net/proofs/artist/b2a56b41-6aee-4b05-a785-a1ca19bd24f3.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Avenida Paulista, da Consolação ao Paraíso
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 0xb584dee0de1be5f38e6787545d289b7ce294aebb83a07246f239dba22d961401. 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/BCRSC2500016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xafef20cf81ea3118373b4533b0fc463836a793f83d6f8e11ed267ea2b1b60d48. 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/BRELD1200058.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac1792bc6020380ad994706dd01006c18beee74a9215dcce1533713ccc0d82db. Chain 2 (Bitcoin): anchored in block 956349 (2026-07-02T11:34:59Z), 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/BRRC72400004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1bf3852e20b4f8b05fece4a40b9bc3703cfa056792b66c8d0a67fc71432a829. Chain 2 (Bitcoin): anchored in block 957084 (2026-07-21T17:12:30Z), 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/BRRC72400003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xefce146389e7d70239ad5f7060993546bde63945f365c6c35b5a690ad879840a. Chain 2 (Bitcoin): anchored in block 957052 (2026-07-07T14:50:41Z), 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/BRRC72400006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa02d033b222e040477602d64a0ce5a484eb6ef29086d781d0e717b18f8588fe2. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-22T00:55:03Z), 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/BRRC72400008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2dac203fa9b7a7aa67982bd8d4fd7fcb332d84264031c80acabb23075cfb28a0. 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/BRRC72400019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xceb3bb75e5694de237aa00b5fe3e5c8e5a59f1402c8e3698d2ad7fcb8df42853. 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/BRRC72400011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13966a82604f25a2604fa8bfd648dc3fd50123374f0e9d3e22d29232a2907982. 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/BRRC72400010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1462471f68cd56a6ba54f15c054ec36a3fa4969303dcb8caa1d4019a741dd029. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/BRRC72400002.
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 0xecf4eeff1ead62382dd5c429db71eb04bfba2ee88d207a048332f2b778f7b70c. Chain 2 (Bitcoin): anchored in block 960175 (2026-07-30T00:16:15Z), 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/BRRC72400001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfda5962d001396b52ee9e33b60d381012a24dc4997c10e12182c581605260157. Chain 2 (Bitcoin): anchored in block 960222 (2026-07-30T07:48:45Z), 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/BRRC72400018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x044d319d433cce7256c6cc349e5797206f3045baac4f32a1ae0b77fc15f96d2e. 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/BRRC72400005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26f6f1d35164747c6e100e430334828e0ecace1a7c76e7e72dce36bf06b3f8ec. Chain 2 (Bitcoin): anchored in block 960106 (2026-07-29T12:41:21Z), 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/BRRC72400007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b2c42cf13935ec649ed4da9f3d791afd999ff73bb783da9f53a664554ed4997. Chain 2 (Bitcoin): anchored in block 960145 (2026-07-29T21:13:37Z), 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/BRRC72400009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89875fe4432244850719155240f2c881b4b4b021a1fa9ec93aec9bd0cde4f778. 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/BRRC72400012.