Star Guard Muffin also known as SGM is a Polish band formed in Brzeg in 2008, and suspended in February 2012. It consisted of vocalist Kamil Bednarek, guitarist Szymon Chudy, keyboardist Radek Szyszko
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 0xd7206d65212438069a78c50618238e9bf1c0fe887f15ab4fa647aacdb4f3a5d6. Chain 2 (Bitcoin): anchored in block 953423 (2026-06-12T21:20:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/2d45425b-53f6-492d-a6ad-df70a68e6dd2.json and https://artists.proofprofile.net/proofs/artist/2d45425b-53f6-492d-a6ad-df70a68e6dd2.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 0xdd1923d1908d552706b3e0484e47b2f7351a9eaf9d9aef7f0e05cb0722bf635c. Chain 2 (Bitcoin): anchored in block 957919 (2026-07-13T23:58:45Z), 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/PLG251200548.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x823b8c58b152f7dad3e052be9984c4895c416c3bdb57831e3c828d7409ff0e0b. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/PLG251200553.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6ebad939ec7e272456227fb96e4ae5752d6c6b38524d68edbd6c471c80fd40a. Chain 2 (Bitcoin): anchored in block 958432 (2026-07-17T15:43:17Z), 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/PLG251200554.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x576c147d5f1f4c55081d6c4c48110a38b61b769589eea2541e7beb3aaa4706ec. Chain 2 (Bitcoin): anchored in block 958576 (2026-07-18T16:22:28Z), 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/PLG251200556.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x871d7eb33989e4d4615d53c61da98edb6d649e03c4a76bd3dc2660f1f84d37ee. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T02:28:13Z), 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/PLG251200557.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7b71c588b1b071c7fce2aea873a521379e24ce19a0b8dda8f32c120fb78f9ee. Chain 2 (Bitcoin): anchored in block 958322 (2026-07-16T23:26:48Z), 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/PLG251200559.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc77bab27d915aeb389e51fc9b7e3465a14851a362ae1418d704872f9b175842d. Chain 2 (Bitcoin): anchored in block 958234 (2026-07-16T05:47:29Z), 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/PLG251200492.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59d15603f04763f9fe188b2fb33235a2ba90a97d04e83cbf8556cfccab1fb84c. 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/PLG251200493.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a85787344ca1112d7b0e4a33ff85ebdb6c8fb2d8728437f3833571c283cda8e. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/PLG251200495.