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 0x8a1b1fae550f627896be983990bb23d9f25d7e40a77a60a2450f5f607729ffc4. Chain 2 (Bitcoin): anchored in block 953620 (2026-06-14T09:36:10Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/1daeb3cc-9b67-4adc-9a6f-136f3795dda7.json and https://artists.proofprofile.net/proofs/artist/1daeb3cc-9b67-4adc-9a6f-136f3795dda7.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 0x526807ca26f394d86f9e296636bf363c9167d97f212dac96911a8b3a43e2c50d. Chain 2 (Bitcoin): anchored in block 958853 (2026-07-20T09:11:53Z), 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/CZA163200004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38c715f84085a34c2833040593c2167e33bfe0c881bf3937f30205036b72c169. Chain 2 (Bitcoin): anchored in block 958468 (2026-07-18T00:27:51Z), 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/CZA163800007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbef2495b0a6cfb50676a155a0a905894a05b30fef37b741e4f90fa9caf5940b4. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/CZA163900003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16b9f34ff7f39e2424f084f0cd3a1d6d228bcb2a02b3dc66302571a3939c6d04. 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/CZA163900004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6622b85d36d2516c54f0bf1872160f3959dbd41ea6eac1f284a1e80d3d4386aa. Chain 2 (Bitcoin): anchored in block 958228 (2026-07-16T02:46:47Z), 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/CZA164100004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc38dd3e614b6b41222f235497eff0f1b8e48fb616b63334b342b1d8fa0240edb. 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/CZA164200003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa713c189bbb02268948d0c720cd0de4adf7fd0a3aeeace84c2f0fe6c6ef768ae. Chain 2 (Bitcoin): anchored in block 959073 (2026-07-21T23:25:37Z), 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/CZA163600027.
Czech / Slovak Retro Music / R. A. Dvorský, Vol. 1
Czech / Slovak Retro Music / R. A. Dvorský, Vol. 2
Czech / Slovak Retro Music / R. A. Dvorský, Vol. 3
Czech / Slovak Retro Music / R. A. Dvorský, Vol. 4
Historie psaná šelakem - To nejlepší z R. A. Dvorského 1936-1940, Vol. 2