thumb|1956 Maico 250cc Maicowerk A.G., known by its trading name Maico () is the name of a family company in the Swabian town of Pfäffingen near Tübingen. Founded in 1926 by Ulrich Maisch as Maisch &
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 0x5f4031981a9ed72f08f4396187b6b42f54452d4cdd3bb36ffb16788891d7231d. Chain 2 (Bitcoin): anchored in block 953778 (2026-06-15T11:57:35Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/b43c0567-2b91-4deb-a499-edd6604f1949.json and https://artists.proofprofile.net/proofs/artist/b43c0567-2b91-4deb-a499-edd6604f1949.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 0x82dcd68b4eb7d2979afac47fe49888b9fc9b0ac50e104f40ce4bf0a70bb2d8b8. Chain 2 (Bitcoin): anchored in block 958514 (2026-07-18T06:54:37Z), 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/ES71G1704510.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82dcd68b4eb7d2979afac47fe49888b9fc9b0ac50e104f40ce4bf0a70bb2d8b8. Chain 2 (Bitcoin): anchored in block 958079 (2026-07-15T00:21:05Z), 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/ES71G1704510.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf045e72f83c1c8b0d2a4b75a8125935172221fb7da4bb59da695ae47da75cf45. 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/ES71G1728249.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5faaec537b283a266834a31d75b7cbb727c30e5c2ff6b6dafc3717ca6e48739. Chain 2 (Bitcoin): anchored in block 958601 (2026-07-18T19:27:02Z), 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/USLZJ2507905.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x995ed8db5dcb7424fd830f6bf8ff2463173e6963d7fe27447579acb2021b2e25. 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/QZTV32552671.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea991c822d381cf72b230704514cd65363980db21cf7e747aadd121f8e703404. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T16:47:41Z), 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/QZWDE2559242.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x048b0eb15d955a7258e302974cc8a0be99beec3a10d421b6aed7f11387335993. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/QZWV32563693.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f33bd131d4699a2cb3e456ae175b1a2113a3058965e32b4c4889a5d5a43c2ab. Chain 2 (Bitcoin): anchored in block 956790 (2026-07-05T12:31:54Z), 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/QZZ8A2520117.