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 0x235ba764863f862e3da349c83b44d5b2f0f447c3794b3ba54819358dc9071ff6. Chain 2 (Bitcoin): anchored in block 953645 (2026-06-14T14:31:42Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/3e655af5-db72-432c-af35-90868850a946.json and https://artists.proofprofile.net/proofs/artist/3e655af5-db72-432c-af35-90868850a946.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
V Hospodě, Vol. 7 (Nejrozvernější Staročeské Hašlerky)
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 0x52042d04851de67177972b53c020bf5456a2791df8d1c176d03a1be753da7259. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/CZA380233202.
V Hospodě, Vol. 6 (Lehce Přisprostlé Country)
V Hospodě, Vol. 3 (Sprostonárodni Lidovky)
Včera Večer U Kina - Včera Jsem Tě Čekala
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05ef64e5ef83bf02c8bf4e403b69d43e89c99e1aec06dcab3fe0dbafcb43548b. Chain 2 (Bitcoin): anchored in block 958436 (2026-07-17T16:42:22Z), 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/CZA380114201.
Seděla Pod Borovičkou / Šel Dráteník Po Ulici / Chodouňská / On Ti Hlavu Sehne
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f60848a2d5355a0a5dc4f6e05ed7945f7741a7c287adfb0c2cac529b086fe62. Chain 2 (Bitcoin): anchored in block 958383 (2026-07-17T08:20:01Z), 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/CZA380114213.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7842995aba43cc8abb9ca3ae19fabdcd2f64e8c94efa5a4d1055e4446be0c3cd. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/CZA380114222.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee414839344ba03586f956f1b794a50bd399f492bd28e4fffcfda50718355271. Chain 2 (Bitcoin): anchored in block 958388 (2026-07-17T09:14:21Z), 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/CZA380114224.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d9606468ecf14109ff9abb1868b5f49a8b47d5b573ac6a618ac08c6d3a937f6. 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/CZA380114225.