Zica may refer to : Žiča, an early 13th-century Serb Orthodox monastery near Kraljevo, Serbia Zica family, a historic Brazilian family, originating in Minas Gerais in the late 18th century Zica, A
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 0x57e265bade98f80e0103e9f54789d386059d34c00f5ff70b12597dc8eb5a918a. 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/91754f89-a4fa-4215-b0dd-4e9b8cf203d7.json and https://artists.proofprofile.net/proofs/artist/91754f89-a4fa-4215-b0dd-4e9b8cf203d7.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 0x09868750cb830b90e54a3b44df378010cf4f5404f9edf1837d69e1cb254dfbbd. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/ESA012146691.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd467c72b639a42143cb04bf371117a7534568ba3f56ad33b134dc55f1a1eba28. 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/QM6MZ1943608.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc22c9946e7d8b48f57f1d878cbafda7abebed99dcdef135912d1e7d792498e1d. 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/QZGLM2009291.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x086b8877bc8a3508a0752474da0748d4ce58982324613b249cd14a29e0989fac. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/QZHZ41941808.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2d7624c71e316b5dc75a9c3ffc926204aab4d807211c04011aaf127010ea305. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/QZNJW2147138.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x536db8e565365c76c81e02b8af52d6f3292d6d8db18d6a428fe69da197e62a2f. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/QM7281881484.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8d4825721e51498d2229b291bd22055a0a710d2997799b001d592be91fb67b5. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/QZNJV2370485.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b71af78990c8d8dc8c622127658a4b477cd63244432ebcb92fd585be8e7447a. 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/QZGLM2066686.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f51cc9f7c63045f9ddd96f35c7b0f210bccaef9cc7bce55117b1b929f550eb1. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/QZGLM2066687.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44bb1d205dcd8a5725220517cce0fc5970d255763149094700cd28184c40bf1e. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/QZGLM2066688.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f988b6ec0a19863beba264ba58aecc0788f5ff91908bee6fa9fa455ad5ab906. 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/QZGLM2066689.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ed2a79274cc66674e8afe7d298b131dc1f5920c4a34d6ec4de4086cfe6cd354. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/QZGLM2066690.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29da765ffd28bf096fcdf0828d3619aacd1dcf7e9d2bf0ba360183ec59759710. Chain 2 (Bitcoin): anchored in block 954130 (2026-06-17T19:07:14Z), 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/USLD91741446.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a9d05290db56d467221adafe3ae24374f9143b59b5a4d83749fb05ec77c144b. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/AR8TN2200387.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcebee998cb7ad7087720d8e6f742f5e7da97a938a80ba8231aa0a95f29fc3bcf. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/QZMZ92099950.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf80044988988042a55ae76b15a5824afb22ad2bb4e338b5ee372ef506d0f9e70. 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/ARIXB2401392.