Ultramarine is a deep blue pigment which was originally made by grinding lapis lazuli into a powder.Webster's New World Dictionary of American English, Third College Edition 1988. Its lengthy grinding
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 0xaaa80308235bae906e33a6c667f957f3e7dd88eb10aabde4cb618f37fcec5d42. 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/b6b751d5-0957-40a1-b3e3-7b222e54724f.json and https://artists.proofprofile.net/proofs/artist/b6b751d5-0957-40a1-b3e3-7b222e54724f.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 0xa29aab43cfbcb4890ba46bc8bde2ddee2c27a2daa571cc0502387f407bf5b3f5. Chain 2 (Bitcoin): anchored in block 958802 (2026-07-20T01:04:02Z), 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/USA4D0213101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1e7bd92159e75658dd936bf67c548f6969809b539a32a721441ccb695f7f22a. Chain 2 (Bitcoin): anchored in block 959132 (2026-07-22T13:20:46Z), 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/USA4D0213102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1cb136974550af3cb37c2579e42fb20e2ae4ab48c19e348bf1c02fec8902956b. Chain 2 (Bitcoin): anchored in block 959069 (2026-07-21T22:32:59Z), 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/USA4D0213104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ccdd93013fb702eabb1fd62e049dd334d4d7efa5538777eefb96792ad09fad6. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/USA4D0213105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99605dd896686e6a7d2ad5c3cab6dce28c1782ba41da3624b731b53e3d66d0fd. Chain 2 (Bitcoin): anchored in block 958667 (2026-07-19T05:04:54Z), 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/GBHBR0401108.
Companion: Every Man And Woman Is A Star Versions
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x388433ab81587defa56edb293a91179711deab3f12ef4baeb0e77b214a362ac8. 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/GBHBR0402567.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3cdca28102ce5542f1896d104c5be480a28836bfa6b1e12a61ec0db69be30639. 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/GBHBR0402568.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d809742fb6d4f71d79238b4ff656dce4da9b3a843513632fbb05016270c39cc. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/GBHBR0402570.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf36f6cb049206a5f54301847d0cdbf61b26327a5627bb84cb7caac8398fb3e79. Chain 2 (Bitcoin): anchored in block 958465 (2026-07-18T00:04:42Z), 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/GBHBR0402571.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9896768915e7ac44c125c831e79de848471458d5148ffb8de60b660c597f6aff. Chain 2 (Bitcoin): anchored in block 958996 (2026-07-21T10:57:35Z), 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/GBHBR0402573.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb75c39e80dc1313b178ef1a98d2f848a899cea7d2d11f09ffb21fc227e8ff8e. 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/UKXNZ2400134.