Kuba or Quba may refer to: Places Quba, capital of Quba Rayon, Azerbaijan Quba District (Azerbaijan) Kuba Kingdom, a historical Central African state Küba, a village in the Tibet Autonomous Regio
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 0xec53403c9a50035542a67273242251f2f8b1d43e1a30f9bfdfe1f5b56fc604d5. Chain 2 (Bitcoin): anchored in block 953754 (2026-06-15T06:45:19Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/af85efc4-1796-4eb2-b648-3358afcc0827.json and https://artists.proofprofile.net/proofs/artist/af85efc4-1796-4eb2-b648-3358afcc0827.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 0xe581c019ed84062ed80171087f00b5a3608c5560c52deff25d8224a88b792762. 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/DEYW82414880.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d8d4495fad63d19504f9b1e80e28032dec0f60f6c0157ed9def12f1b29396bc. Chain 2 (Bitcoin): anchored in block 958708 (2026-07-19T09:08:25Z), 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/DEYW82417810.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3e4b1e51af90c49711b4829676fc9897765b87c6f993b32489621164ebd3d3c. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/DEYW82500531.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70194e3cfe372dc405cda76e657e85b1924f4d06fcae049bbc5552e237cfb9ba. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/DEYW82503855.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d3e55c112336e027d3dd29c500b39baa007987831581f778f745cf4624506c8. 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/DEYW82504586.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd809bb101858021831191d86fac9f49632a59da1ce8d80b999d4182b2d6e74ff. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/DEYW82505234.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c44b294acf62221903bf38ae19f97923ebc9d6e35837a0a349eb6492228b4f0. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T02:05:55Z), 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/DEYW82506700.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8f43c19e7963a8f03941ac613e35bb4481aaa6b9f9685bc222c009205d0a067. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/DEYW82508534.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee8934f7420379b63fa3b08a6f59b8674cc496f09ad4d6754b5b43da15d753cc. Chain 2 (Bitcoin): anchored in block 956560 (2026-07-03T23:28:02Z), 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/DEYW82511637.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed916283dbeb164f5df7d751eb50525ceface28807367d07edfb0367ae877342. Chain 2 (Bitcoin): anchored in block 958817 (2026-07-20T03:52:09Z), 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/DEYW82512294.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64eca73384d951039c91a6b10e5a02625cb4e2f775db8f936b7502bbce1f1ec7. Chain 2 (Bitcoin): anchored in block 957782 (2026-07-13T00:52:48Z), 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/DEYW82512890.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61f0346f4e49e33613928e40bec490dcafc538a98b64dcba60f1909e5e7715e1. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/DEYW82513710.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59b3ed7efbd6be16afa9d01172916335c9411d03da7d4f668f42d011aaebfd54. 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/DEYW82515233.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c0c864cab40ff9a17213aefeb677529bc17259da4999c11dbe0decc13fc3797. 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/DEYW82515866.