Jan Vodňanský (19 June 1941 – 10 March 2021) was a Czech writer, songwriter, singer and humorist. He was best known for his collaboration with musician Petr Skoumal. Biography Vodňanský was born on 1
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1bd3c9d4918c4fa55357293165d7330b37347347365acee1528e96a132ea27ff. Chain 2 (Bitcoin): anchored in block 953633 (2026-06-14T12:47:11Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/3480a717-e4a7-4058-a026-8d149c972885.json and https://artists.proofprofile.net/proofs/artist/3480a717-e4a7-4058-a026-8d149c972885.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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ff6b72ef4522a42b751461660bf4def75e484ed1ee244b738ea3e7c1e034845. Chain 2 (Bitcoin): anchored in block 957061 (2026-07-07T16:07:00Z), 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/CZA167100629.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94da8e6ddd09399279a84c0e107e50b4686c73b010a8a7f47f93e03782de8a40. 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/CZA167100630.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b27b8c783100f2d963887d05e1d14dfe5d6e62189feb8c15511b1aeec28df5d. 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/CZA167100633.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1469259da0ccb03c9e173ff53c0cfb5848a6465b5f6bbd7752fbedfc875924d9. 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/CZA167100646.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf00fb09040425b03f6b97ccef7629b971bb3cdfae6f912ff426ea3758aaf4f7. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/CZA167100645.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc23448eb9fe727bc0d79aec1c2852637da31732bb31673c1ab2e5be5becbaaf9. 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/CZA169000749.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa87a8a39bc41f28c393e25e2f139c93d1c1b3d3f51a53e14a5199a0b839867a2. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/CZA169000723.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaff3159a5f9b10ce0f42ff09524ce2c994b28c8c3e832b1875380f8270bf3640. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/CZA161101131.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8135ecf3976b749e34c0e0619a94dc525d3053a213b916d27674951a4e88336. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/CZA169000748.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55cad79210b9354bbf751c23ab255a4485b19592324c64ba4aa9c14c74f98933. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/CZA161101132.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45353d304da8e2abb03887009a6bcd32212c8741e4434e09b573f87c99b0db79. 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/CZA167400558.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4eafb4a7182600bc752161c16fa3f3b42b8905d8812a499f886ff29c3812bee. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/CZA167400563.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15a4fb33b63f7c9b0d62df32e2274f6e882d6fddae1e7a09c912a4c2528b7130. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/CZA167400564.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6fb4e0a76f414e29b8e7c6a92c737bd0e9967f23f0d34a62adb274a76a70d9b9. 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/CZA167400566.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3140af9741e8fdd04b899e733a2368895b891a01da6faf488bcd95cf46af9af. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/CZA167400568.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3cc71a1c43e540160d4a7289d2921fb9b69bbc736528e8eafee31546d27dbd3. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/CZA167000518.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9884fc33b6c0da070fe63c7ba7d990d930b2c3fc2614e4ca343a2a2a9945f8cb. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/CZA160505489.
Sady Riegrovy - skeč Zavěstě, prosím aj.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe296bf90161855f83d63dc6a0ba436828486ce851d8ce691d3839caac6f84717. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/CZA160505483.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e65430a0d02a03bc0c638091fa031dee9f78fd732d03019b8ecc78c487c4995. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/CZA167100468.
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