thumb|Zequinha de Abreu thumb|Zaccarias (Lyrio Panicalli): Tico-Tico no Fubá, 1943 José Gomes de Abreu, better known as Zequinha de Abreu (September 19, 1880 – January 22, 1935), was a Brazilian music
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 0x79422a2d39379f2d7a82a197ed97db17fb8204bc4bb74dd44ebbbc4f061d6926. 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/9f63716f-4ee7-4a64-9cbe-115fa162cd55.json and https://artists.proofprofile.net/proofs/artist/9f63716f-4ee7-4a64-9cbe-115fa162cd55.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 0x5c5760969718d3d35506935aa80305a9cefc0246a26742b58af29c6f9291ca18. Chain 2 (Bitcoin): anchored in block 958510 (2026-07-18T06:38:22Z), 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/BXSPK2100022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16db9ac090b9bef579e7d987987a5e4afd1f839e4cac585389c7942e63a3f5f8. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/BXSPK2100029.
Abreu, Parker: Tico Tico (Arr. Horsting for Recorder and Ensemble)
Tico Tico No Fuba (Arr. By. Alex Zielinski)
Tico Tico no Fubá, Arranged for Viola Solo By Marco Misciagna (Live)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91be67391507863164556862d223219ab21e58d1a361fe30f7da34a46dfa0ca3. 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/GBPCP1400010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a88d1306b70088380d1ee166213aeff8887c126b097cc3613374b7237cf1dc1. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/GBLLH1439310.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0cd6559e7e5eb63f1a2b88f7aa56768e6c800da09916d1750de1e7d9b76b53a1. 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/USFKZ0610432.
Young German Brass Soloists: Just for Fun
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd79c321b81e373eea38b97bd6d96481bd74bab10a2866563319c5f1de7a7e613. 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/DET900404615.
Tico Tico no Fuba - Arranged for Piano Four Hands
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e538b3f27bc60694565a8ce551ed4396025a7281bda5f74f3c94e1117960709. 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/PT9HM2000011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5d6f0ed5708833c5f2cc2856888c911e4805ee093ce720b102227154a37ab63. 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/USTE10301235.
Tico-Tico no Fuba (Arr. For flute and guitar)
Schocker, G.: Dream Travels / Machado, C.: Musiques Populaires Bresiliennes / Bartok, B.: Romanian Folk Dances
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1af40e261435530f45d67ac2d8af143b4e7cbeb9415ac8267900f19efa730d8. 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/US37B0602315.
Tico Tico (Arr. Horsting for Recorder and Ensemble)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x890ef1f4fd8528dac9c7b246e59247bebf8e53ad91849915308c10ce328c9e7c. Chain 2 (Bitcoin): anchored in block 960170 (2026-07-29T23:52:38Z), 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/GBBBC2200458.
Tico Tico no Fuba (arr. C. Barbosa-Lima)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05d3684b7c2a63c71b9a65669db74e7fd9a3a33ef63aba4ac146451c0ba7dc9b. 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/SEAQB9200609.
Tico-Tico no Fubá (1917): Tico-Tico no Fubá (1917)
Cross Atlantic Trio: Danza, Baião e Samba
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x134c249671f728cef591f148610b2e84c36f255946eae58969484c4e4c6b5b06. 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/ATTE42405608.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f596bee467f01af63cb8996d2f79b2777c683d7b7f0976c8b851ade71e1a904. 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/GBAYC1601534.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50fbff0b5cb0d1e7e7ba9092f049aaf561c77e7cb86340e33d7baf7528263f72. 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/CZA160701484.