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 0x6341e151c9aa1c126de82d1ae8382120aaad93a41dec1113b7d1c001dd81ec08. Chain 2 (Bitcoin): anchored in block 953768 (2026-06-15T09:30:06Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/c1bc4023-8204-4326-bc36-fcbeefebfd8e.json and https://artists.proofprofile.net/proofs/artist/c1bc4023-8204-4326-bc36-fcbeefebfd8e.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Violão Brasileiro (20th Century Brazilian Music for Guitar)
Passeio No Rio - Arranged by Carlos Barbosa-Lima
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 0xf6f0160c615e44bc809b89111e6e33ef4b74ffd0a6f607242f02e3ed9c233c40. 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/ITLF52005361.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x690477a14971d097aac5c42bc4bc49114c47aeb1897398d682c29d125d40b1f5. Chain 2 (Bitcoin): anchored in block 960121 (2026-07-29T15:22:21Z), 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/ITLF52005362.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4831be2179d473a2f564770484967a509f5b4e2f2589c7986c683eda751ba40d. 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/ITLF52005363.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x787f2a99ab5e4a4af39b6b9e9f27b507c0c2eda07fbf224333e721a38cbf7fb8. 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/ITLF52005364.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc38e012f8eb824f969d54d203a057da4cfb464890713d2ab67c1bce7ba5a864a. 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/ITLF52005365.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6939ffaefdbbbe4fdcf999ef1c46c973e59a5c7b5e2fdf257c192c2074c6f3a. 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/ITLF52005366.
Inspiração - Transcription by Paulo Bellinati
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf08b9a8d93eb24c67f3968deb70d94843203bb1f3d1df2c6f113c9f067e9e887. 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/ITLF52005367.
Lamentos Do Morro - Transcription by Paulo Bellinati
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12191137094b1db25c6913ebf8de3b2cb66d72ae41cc145de9ee666195262739. 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/ITLF52005368.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4cc0bffb6a374d05426fb9b30129e05960af478ab56b0caf74b26a63f0107b21. 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/ITLF52005369.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28089c21e791e881e702762d7609b0341e63714f6cdfa696f18d521a8fbac528. Chain 2 (Bitcoin): anchored in block 957048 (2026-07-07T14:18:56Z), 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/ITLF52005370.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x307169fbd4a29e65962bc7cfe335d8a83bc574e855b61480df602afab53bc86d. Chain 2 (Bitcoin): anchored in block 960150 (2026-07-29T21:51:49Z), 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/ITLF52005371.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1664f53d4889a3cb598b9dbfaf54c917d42806c806fdb673ae8c3a83662c9a13. 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/ITLF52005372.
Impressões Brasileiras No.1: I. Estilosa, valsa
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7f7004dd2288d702c844b7c978528329d539be797dd2a53413dee6b53b0c81d. 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/ITLF52005373.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48d0396f32f4a6c1f465a2ac87097a3d349ea51d0bd04242610fba72b4d878d2. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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/ITLF52005374.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6404dbda9351d59f6d2c4e0ce78a72cdaf059cab4a5091c894dd69fb4cd0536. 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/ITLF52005375.