Maria Rosa Canelas (July 30, 1941 – June 10, 2004), better known as Rosinha de Valença, was a Brazilian composer, arranger and musician. She is considered one of the best acoustic guitarists in Brazil
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 0xbf9a83940289a0bb346c8261f924be73ac394993e692f31fa816a617a858099a. Chain 2 (Bitcoin): anchored in block 953423 (2026-06-12T21:20:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d1aab196-e277-4d1e-b0a4-0864b9639572.json and https://artists.proofprofile.net/proofs/artist/d1aab196-e277-4d1e-b0a4-0864b9639572.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Rosinha De Valença Apresenta O Ipanema Beat
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 0xebc1af3a1f34568d7240e43246062931cf1ec0ddeb4328683b6b3c72078693b5. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/BRBMG7000060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68c1ffacf47f4e1a76763a3983674ae46ed3d6d061f092f1fb4be0068b3b6e2b. Chain 2 (Bitcoin): anchored in block 956713 (2026-07-04T23:03:25Z), 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/BRBMG7000062.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe276e170e8f16e3c3eea48d56e6c8b3262d7bb4b5848ac8df0b9b99bea728b96. Chain 2 (Bitcoin): anchored in block 956440 (2026-07-17T03:34:00Z), 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/BREMI7600744.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfae96104a39c7775b1b4313fd968e919a3ccdf5a00f1dd5a101794d78ca54b2e. Chain 2 (Bitcoin): anchored in block 959089 (2026-07-22T03:51:17Z), 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/BREMI7600750.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2874fd2a40a33d4608638500b25ce743fc235016680b0d83c0581037b1d2e216. Chain 2 (Bitcoin): anchored in block 959008 (2026-07-21T15:08:04Z), 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/BREMI7600753.
Rosinha de Valença & Flavio Faria (feat. Toots Thielemans)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2dce3f5e438eecbb0095d654206e02852f408e5c8e99c80c9dfaa0d2607b911. Chain 2 (Bitcoin): anchored in block 956728 (2026-07-05T01:43:49Z), 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/FR6V88900722.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70c6593b9e3bfcc1d8d5986b574c9390d739a0156414b82671760d8c129b048e. Chain 2 (Bitcoin): anchored in block 957899 (2026-07-13T19:36:39Z), 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/FR6V88900723.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b194c810cadd0873240e5b595cb2813b93b83630e151a82553ad08a4ad7406d. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/FR6V88900724.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe21f5e9b0a618a10fa427a99077154d853ed5a305ac90d71e727aec9f4f3088e. Chain 2 (Bitcoin): anchored in block 958749 (2026-07-19T16:35:58Z), 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/FR6V88900730.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x990d512118b7afebc28cdb38a317d755b387ac3c3e9431332ea645cfecd9fbc6. 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/DEA116702360.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19d76478870b91d3fc68be25143e51343c5442c1758b744df014c205597e0291. 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/BREMI7600751.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xebe1db758eb8bcf33af2d3b02c72e340f62ebc703d6df73ab69f39e87c807288. 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/BRMCA6500053.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64a72b8b668a7e4c3232aff4d5f481581defdf328eb67a19535a777ab11d64ea. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/BRVLS9400596.
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 0x702f28a03ebdf8eef0965e87b4a79328086d14f63e3f6ba08f7965626753e83c. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/BRBMG7100064.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf938e32fbd649c6e49231d28026728cf212820f059c7e7ef882b7079ed32fb2. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/DEA116702350.
Berimbau / Cuica / Cavaquinho / Tristeza
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a27f48d7faba662f791bd1b22f87074f30719435247fd9d55276cb07b6140ab. Chain 2 (Bitcoin): anchored in block 960209 (2026-07-30T05:15:54Z), 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/DEA116702430.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98a8341d603289c03b0d0202a1c5c13ccbb2fd79534d7048892236b6ff8a5b8b. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/FR6V80003620.