Rozpor is a Slovak punk band from Bratislava, Slovakia, performing Oi! and hardcore punk. They are known for their strict anti-fascist stance. History Rozpor was founded in 1999. In 2000, they self-p
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 0x9877cf6ba2da6898f668a10e7fa48c18af17e5890c7da58379a09acedebdc610. Chain 2 (Bitcoin): anchored in block 953791 (2026-06-15T13:40:30Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/de273206-0f68-4f89-8fed-9ef0f87be711.json and https://artists.proofprofile.net/proofs/artist/de273206-0f68-4f89-8fed-9ef0f87be711.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 0xcad34731b9c2acd801f08e12153285f0cd0720eadeb90a007222f7281f7bfc2e. Chain 2 (Bitcoin): anchored in block 958341 (2026-07-17T01:08:10Z), 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/USHM81856453.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1894af7e9ffef8105963c062fa1d1cd3f0430cae69b0de62d853319e7f66484. Chain 2 (Bitcoin): anchored in block 958905 (2026-07-20T16:14:34Z), 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/USHM81856455.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7cdfd87d2e31cc65f25af12f5d567035293f8e02dfb3b3452a0753d6d31143ed. Chain 2 (Bitcoin): anchored in block 958897 (2026-07-20T14:57:46Z), 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/USHM81856456.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c348b375f8f3d81d77be565ff069adfa93f73df1ea0f401b4e1ebde8820275c. Chain 2 (Bitcoin): anchored in block 958216 (2026-07-16T00:00:34Z), 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/USHM21862630.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb6aa09b44b59260509b63c4555dbe34ace8eba66bc1f14d7f9605fc98caf592. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/USHM21862632.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52aab61e8e2b83a8b6338b79aa286343ebe86ef12e17f0e21b4298ee8e1d6518. 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/USHM21862746.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43b71073bb1b04fc16c51441d5b46d0f8af199b5d790d1be3d139f0a66c8840c. Chain 2 (Bitcoin): anchored in block 958447 (2026-07-17T19:47:19Z), 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/USHM21868320.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27e941e3dbec8911d50749007bdf0159259abeaa356a6db056a48377f8e7ad92. Chain 2 (Bitcoin): anchored in block 958063 (2026-07-14T21:07:34Z), 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/USCGH2239946.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8beaca67b9b941de190b9f71c9937a53b6e33a7fd791e3b99496b7c036bb1087. Chain 2 (Bitcoin): anchored in block 958714 (2026-07-19T09:51:44Z), 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/USCGH2239947.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a6b1b18f5af05b40ff76168e1ea4e10f2b0495476c314becbf601bb7f7df965. 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/USCGH2239948.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6fef95dfba1e61ee95ecebf182c5849af4f85c0057478c647ecf7de9d9e55de5. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/USCGH2239949.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe45ea2d4b8d81ebd60be6ea5ad54f7ed2102d0e6803efdf124d4aee7d473abda. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/USCGH2239952.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c314cc7b2dfe10087dc3cb454f43abc41ede6337fbeaace6203b487fcae0e1d. 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/CZA163364461.