thumb|Watercolour of a Mahdist jibba held at the British Museum thumb|right|Late 19th century Jibba in the collection of the Essex regiment museum The jibba or jibbah (, romanized: jubbā), originally
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 0x7453efce06bf9521453fe51832985a02325609f7e6290ffd0f912238545ca323. 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/c5ade48f-9806-44fa-a6b4-76bbcad1b4e1.json and https://artists.proofprofile.net/proofs/artist/c5ade48f-9806-44fa-a6b4-76bbcad1b4e1.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 0x819df13141f8f5b78b2a02679cb4e95e569d3a9ca409d5bad3e100514af90b8c. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/QZFZ62445715.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30195a520c04f9d0cbd24c78c6ff01020bf8af6f8f1a8865d239a46d5ea91b1e. Chain 2 (Bitcoin): anchored in block 956482 (2026-07-03T10:33:57Z), 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/QZFYY2478908.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf83b24e78aa3ab80aeb5cc59575dc9bfc8da70698b8101eb58f4a58d392cb0fd. Chain 2 (Bitcoin): anchored in block 959026 (2026-07-21T18:26:32Z), 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/QZES82483213.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x312303498485f00c449077d721f6d040528c635a1888710bf047d80e541ed473. 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/QZHN32433652.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24131cf206121c8e6fb1ec6c70ad2778ad7bb0b17cdaf499fe03624406b0e9ef. 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/QZHNB2429947.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba8e6e1b86c63d1e0ecaf360e3a1d6fe99b03c5a8314906b82baf66baf7e6201. 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/QZTBA2329006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0cc71090430e91e9bfa0b2b5965efd35d9bcb4e7c62b66160a12c363a802f13. Chain 2 (Bitcoin): anchored in block 958567 (2026-07-18T15:22:40Z), 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/QZTB32420119.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb025783525f27d850e432ccd926fd1fcfa0dc28788cdcd58d5209416211db705. 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/QZTBB2489458.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f3ff77c8360e9182f1f854b9adf5dffc12768a08574466201573cd646bac814. Chain 2 (Bitcoin): anchored in block 959002 (2026-07-21T14:36:40Z), 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/QZTBB2489459.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x456b9b44dfaa25c5c284b4c7a2ae846c991e2d9288dd9f4d53b0356caf0e7883. Chain 2 (Bitcoin): anchored in block 958324 (2026-07-16T21:05:52Z), 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/QZTBA2411271.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x931c2864efde93dbe6a8cca45d0ad114fc34c61b0b20a9f1191e4735972c9194. Chain 2 (Bitcoin): anchored in block 958631 (2026-07-19T00:50:09Z), 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/QZNWV2561904.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f2a1b4bc819ae80980363a0159f30efe1b8f0c5761ec6319116cc076239e00f. Chain 2 (Bitcoin): anchored in block 958838 (2026-07-20T07:01:21Z), 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/QZRP42544229.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x658e0d84e1ec720a5f11699937c2bae78fdf94d49cd86390960331726d3e87b6. 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/QZTAY2545903.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0f9f7cbf7f9d6b1889b65be43834f6a3b838881a913eb1bc124ef0e689d65fd. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QZZ792524647.