Adam Andrzej Ostrowski (, born 15 May 1980 in Łódź, Poland), better known as O.S.T.R., is a Polish rapper, musician, audio engineer and record producer, famous for his freestyle rap skills, ambitious
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 0xa4db31887002edfa9e4d2e605e060ae77245000e40e2beb299690ae64690e158. Chain 2 (Bitcoin): anchored in block 953408 (2026-06-12T19:28:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/07cb830a-d87c-46c0-aea2-9f48d7bacb67.json and https://artists.proofprofile.net/proofs/artist/07cb830a-d87c-46c0-aea2-9f48d7bacb67.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 0x58bf7cf0b663494add036525ed0001d6b2d2e49a35ac36bfc80956f7f45a83dd. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/PLA680800703.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62616b356d216cc22399db68c6b830b50ae24e56883316f01902ef5f2a0ec991. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/PLA680800704.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd442682bd151eac4485442bdee17cffbceada76728dcdfee5e8196903cde1a9e. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/PLA680800705.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0fcbfb1b072cce7287fd4f7d1bc53c424d130852598c97aa89fa37ac2ab1fbfa. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/PLA680800706.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba941a3c6d8ef7188003317d3d457fe72c90a5da5a65bcba972c413fc26783fb. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/PLA680800707.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25397c1d1b6e383ff82275b1f80cb4da7bdbbff1e22889b797d17302afabfc59. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/PLA680800708.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23ae11d3b40f2db155158184d14e4664c9c2bd07e36b2a58e05e77f97abdbc5d. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/PLA680800709.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59220d2e1e1d1723ded4f5a85d89c6db9c1e8c8567b625fd2edbc6ca2894d27b. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/PLA680800710.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed51ae496fc45bfe8df5897e60db47def244eb1700484aba0ad94940cded9c6a. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/PLA680800711.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab924ae32d3b7fa6f817dddcedf8d7f90e0e7a49bc3f0b2bf8d5e111bbedd037. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/PLA680800712.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a9f2b0bd78a526fd8046a325579daee75aaf4d50fdceca7d07c3976e61864dc. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/PLA680800713.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31275d93a6af13b548932fd4f49e9e0c912a904a32e7d27e3a4a59ba81448e88. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/PLA680800714.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7890570bb357530bdc5c4a35669b4d7fd128310bd71455a28690a01aa136cd34. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/PLA680800715.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f89e7f5ffb2263169672269ba8d8d5fdba0ac8817c72a22e7c7183a725b2613. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/PLA680800716.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x507494e2e5555f83ea277fb5ee0e35eafc41db426b41de7b7595291accfde083. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/PLA680800717.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcee80776f8e543fa0bde3414f77cf2db042f30584f44ac764261f144352f29d5. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/PLA680800718.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52fd2fa3e3df5dc0034f07ad6096208ef635c2f345accfc49fcdb832c6a0602c. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/PLA680800719.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7d9181afa06e1d5c40eabddc1f545908c25a0a70b18b6d34831714dc69b139e. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/PLA680800720.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe0025072cfb11b04824a6afabf0281248de244cd2709fa81138d2e1053038be. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/PLA680800721.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f886ef4eeafefea2156cc11fecdff6e5ee26bf6cad020a45bd2ae0623564988. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/PLA680800722.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc82cfb976fe96927be7937eb0af7df1b5096893e236038cbf134bbe904dfcfd4. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/PLA680800723.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b324b3554c5a9584671327e4c64813242769c13e71538fa89c6d8796649714b. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/PLA680800724.
Nie Mam Wyrzutów Sumienia feat. O.S.T.R.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x607cfdabab9e775edccc945f5ca7067c1140b2ba1026581f134ae27820f057fe. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/PLF241401169.