thumb|J. M. Flagg's 1917 poster was based on the original British Lord Kitchener poster of three years earlier. It was used to recruit soldiers for both World War I and World War II into the US Army.
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 0x5d63baa9d3fe95dee7f5a93c02be2d99e1aec85ccdf4f06175066ec8d1e205eb. 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/67a395aa-abaf-4301-8c12-823f175d0458.json and https://artists.proofprofile.net/proofs/artist/67a395aa-abaf-4301-8c12-823f175d0458.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 0xaf68e746bad37f0b7d4c157c3edb452669a4252231328c688212cd8d185ebe11. Chain 2 (Bitcoin): anchored in block 958468 (2026-07-18T00:27:51Z), 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/USSM19604732.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6a3ae4663a214cbfe54fc218655f0ae2e03090aa6b67a7f76c5508feecc5bfd. Chain 2 (Bitcoin): anchored in block 956728 (2026-07-05T01:43:49Z), 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/USSM19604733.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2328225c5b806929bd9a0e5cebed306f88cc8f05a6f0054b168296fdf576f1d. Chain 2 (Bitcoin): anchored in block 956484 (2026-07-03T10:47:44Z), 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/USSM19604736.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8caa9cf52d42aefa9990723984588b4c90ca3616c052e9e1ad5baba02cfcb075. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T22:30:09Z), 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/USSM19604737.
Magic (feat. Uncle Sam, L's, Boss B & Yung Murk)
Underneath The Sheets (featuring Ruff Endz) (feat. Ruff Endz)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c27609bf6ebf1031e69c572028531add2b6e766b5dd833e1349c1a5b40eb3d0. Chain 2 (Bitcoin): anchored in block 957075 (2026-07-07T18:50:38Z), 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/USSM19901249.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08329c04e9f85932bfbf36ae0553f871ac1fc546dac01eceba824fe82fd1fc1b. 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/FR8GV1825890.