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 0xbb62b3f9b1c00c33a29d328fe6c21caecf4f285f90c0fe68de8b1a81d07633a3. Chain 2 (Bitcoin): anchored in block 954728 (2026-06-21T18:08:38Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/fac23899-a5e8-42dd-a507-6e96bfd584de.json and https://artists.proofprofile.net/proofs/artist/fac23899-a5e8-42dd-a507-6e96bfd584de.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Change (feat. David Sancho & Andrés Litwin)
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 0xcb420c9417ab8606c4511c66f344600032d1c0f14bb044a0b09674437e54605a. 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/USDY41924375.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2eb07fb68664fce56a116860bb0bf1dfb00f518c10b853809f0d08cf5072de78. Chain 2 (Bitcoin): anchored in block 960384 (2026-07-31T09:54:03Z), 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/ESA011870283.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d912c4513113861288c335a8a052e0a095d2a1a44cc274d8bb6caf6c9e69124. Chain 2 (Bitcoin): anchored in block 960485 (2026-08-01T00:10:46Z), 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/ESA011870284.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7aff77220dbf24054ed491bc4815c7896d41c1956eda9153508b1dd2d32ef421. 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/ESA011870285.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb890e70ad87751e8319bc072bcb39b1dcd7a1197ffeb70443d55ac2561fd963b. Chain 2 (Bitcoin): anchored in block 960404 (2026-07-31T13:06:57Z), 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/ESA011870286.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae46026ebe63695fe1b0a0793c4c235fead946599d4773b5556bb67a40fa49ba. 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/ESA011870287.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd448c91927e5c0149fefcbda19ad6bb57a3afe1e54683b60db516da374179608. 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/ESA011870290.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac3d4a24aa3e4abc610c0f2a777bf3725e6e340296524784de8f733b326fe7e4. 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/ESA011651525.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a79655b3f2013daff1dfb473e7b711d2733b24059557b432caa2132b3978bbe. Chain 2 (Bitcoin): anchored in block 956891 (2026-07-06T07:16:32Z), 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/ES6102400115.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa62759af06609bfe200cae8f6cbd417d5af5610316ce25e1ec9f7ad8a4f2f77e. 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/ES6102400116.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a79655b3f2013daff1dfb473e7b711d2733b24059557b432caa2132b3978bbe. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/ES6102400115.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50e082b6c7c2b9ddbce4c072476e3068732c7907d080bda20399cd4532e6bec9. Chain 2 (Bitcoin): anchored in block 960200 (2026-07-30T02:37:10Z), 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/ESA092320869.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f443e52cd4a3c4865279d298dd7897a625ca9d1038b64ee4575ac4b182cdcbe. 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/ES33B1507107.