thumb|Ziger (left) is a byproduct of the manufacture of hard cheese (Mutschli, right). Ziger (German), Sérac (French) or Ricotta (Italian), is a group of fresh cheeses produced in Switzerland. Ziger
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 0x302aa58533422b68c2afa2115ca47267d51d1402b8e3a4beb791930e13d517b5. 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/d16ce967-9f60-4a42-93ba-1462dd0a3f62.json and https://artists.proofprofile.net/proofs/artist/d16ce967-9f60-4a42-93ba-1462dd0a3f62.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 0x0b7133ae19eab8c4b589dea14e64f99b33af3d3096570fc6c85ad8f12bacb48a. Chain 2 (Bitcoin): anchored in block 959152 (2026-07-22T16:23:52Z), 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/US83Z2207593.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03f27079da22344715a929f30b88050a4c4f9918b165130f03898e52ace28eeb. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/US83Z2130135.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23892fbaf4f2bf28859586614ef13dad39cae7ee5421b2d6f4640df4949ceb38. 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/UKU932460337.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x616c1a6c18366beae42f7399aab666665cd5187d7c8cf391c05d804b151745da. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/UKU932460338.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13fe2ec7c6fe5e28a8e0cea03808d811193d7878d85fd2ae43855370d8c5a425. Chain 2 (Bitcoin): anchored in block 960229 (2026-07-30T08:30:10Z), 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/UKU932460339.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1fac8b560c6ebeea98dad4fbc2ca8d512e543230da7be99ea356e6d930a2ba86. 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/US83Z2462383.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4216bd468885d51d2deadb1631673bd316de385b64baccf0a98f586d7d282ba. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/US83Z2308716.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3aa77d9d1bb27fd9cb49d35a696a005543bbc412460c82128b6de58a2401b565. Chain 2 (Bitcoin): anchored in block 960222 (2026-07-30T07:48:45Z), 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/UKACT2220277.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7fd2b57466412a65b8b8e9c2a98ec19b1d171fe0df61a76dab04c0769c62194. 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/UKACT2220279.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b7133ae19eab8c4b589dea14e64f99b33af3d3096570fc6c85ad8f12bacb48a. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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/US83Z2207593.
Sky Is the Limit - Mind Conspiracy Remix
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e61b041fc369ebf3697d00deebbfdf0bfbfc2c04e78c00131affd45a016a7bd. Chain 2 (Bitcoin): anchored in block 960212 (2026-07-30T05:43:45Z), 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/US83Z2148647.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1d78bbbdb84ef4a288c3d0365ea353ead3f9346d8a3d7463080a5831bdfe88b. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/US83Z2145232.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa70564fde06e6b01e4f7e5a7a2c00ed17c7fbaa934dd0620767464c4aabc0c9a. 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/GBRKQ2114078.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x322ba411f10550b5ae242b9f70d6d4dce46be9c926fb5faa71f4230f7f6c4bd8. 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/UKACT2060555.