Pavol Hammel (born 7 December 1948, in Bratislava) is a Slovak musician, singer and producer. Pavol Hammel was born to a family of musicians. His father played violin in the Slovak National Theatre,
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 0x1dec54ce54c53f24bec210d1fbcdec33f443c3e9cfe313d3f644167ff6d586a3. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/541b8766-ea1a-453e-b98c-016a8e5f7a89.json and https://artists.proofprofile.net/proofs/artist/541b8766-ea1a-453e-b98c-016a8e5f7a89.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 0x050b4393b1e908762a636f4d5fc659a8e7d2216eca7dbaa12d54730a0207b1de. Chain 2 (Bitcoin): anchored in block 958234 (2026-07-16T03:46:09Z), 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/SKA126923701.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9655066143f7b5cafbbc03f61f7c4b335d4f4606d1f5ca272c9f25e8fc5b267b. Chain 2 (Bitcoin): anchored in block 958689 (2026-07-19T07:11:11Z), 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/SKA126923712.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7e86fba5fe782b59b853adb44925a1135f07be44159fc57946656db0d1f5ace. Chain 2 (Bitcoin): anchored in block 958749 (2026-07-19T15:48:23Z), 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/SKA127219102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae7af5edc29ef2d4a231ffdd1b2bd116ac3603b110c79e8f32af56b77a74b26e. Chain 2 (Bitcoin): anchored in block 958234 (2026-07-16T03:46:09Z), 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/SKA127219104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc23afe764801733b32ad763903af12b1b22e07829ff0b8e0e7876b433900b98f. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/SKA127219109.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x401b7840f53aeeffa52d2557c1852db1dc1e1b7f79651fb4aece1c0fc4bb6791. Chain 2 (Bitcoin): anchored in block 958202 (2026-07-15T21:23:21Z), 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/SKA127533908.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ee0d3e166ca69c1ae7185b5509e62cd5024837e603802fa6fad575acce49ec5. Chain 2 (Bitcoin): anchored in block 958058 (2026-07-14T20:20:34Z), 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/SKA128119801.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c7494547fe9f11148a5773143d56b8f0a36c67b1b789d1f5d8065079ca4c07d. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T02:05:55Z), 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/SKA128119804.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7dee7ba09dd576eacda40c5773800f2d0f30febaa5c68da6eb191076a6d4f2b9. 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/SKA128339405.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad03a69e992d1079c088e70e4c200325d66e6359850bc3c60d3acad5c2bdffcf. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/SKA831105701.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2edf45955e3283a6460a1b7afbd9eb52b814fea5823ee90ef1f67a9fc0953ee6. Chain 2 (Bitcoin): anchored in block 958590 (2026-07-18T17:28:56Z), 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/SKA831105704.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b79416faf344df8e3b27c09542ebf85a63f9a51ddc4e52f1355df1f64c7d0b3. 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/SKA831105710.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8997331e36cf9838de3443a2015fe1f09c6603e5216cf9f82edc72d07668be9d. Chain 2 (Bitcoin): anchored in block 958590 (2026-07-18T17:28:56Z), 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/SKA831307117.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf196b6fe7acd493a2a7a1febfda7414dcbb95a0a2ef157de5df6c3b507ecb1f7. 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/SKA831307123.