+ Cerulean as a quaternary color on the RYB color wheel The color cerulean (American English), or caerulean (British English, Commonwealth English), is a variety of the hue of blue that may range fro
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 0x5293e8bad55d9322be26210818d6dcb00c08645927ca0474534f262c6283d1c4. 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/fca57516-641d-443f-bcd6-24be3fa769fe.json and https://artists.proofprofile.net/proofs/artist/fca57516-641d-443f-bcd6-24be3fa769fe.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 0x06e4af51616a3cd16a25a067c6c311dd9c48e74f2cc8039f630255df3950ea64. 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/QZFZ41937279.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd26febd4c2c1c77062184468f70ced72722e4180a956590e16270da634bee693. 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/QZHN61946082.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00c6fef5ffc098782460191212117fa49971fbd59871272fcdb1bd6789fe1e62. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QZFYW2077165.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x775cdc87f618c50c294d770c88b1c1630a81db956f4ae4c7401d38dcf013e4df. 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/QZES82097774.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1790690778f0a18161319df6bad6178f833c78c2744d3ab592210c4fbae8ae66. 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/QZES82097775.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28d705c8005f25fde476ba651aa4c2e5cd449fcd6d1053bcde1bd74a43cceac1. 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/QZES82097776.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d7e1774c254fd238f88d3246a555d181276cc6d056d6f0f3f605d5f34080b85. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/QZES82097778.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69d4322a49fec6a84e96706d8fd569c960718c4ff24f219912ee9412706c6dee. 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/QZES82097779.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x814744e5579e71b0d44816f527fbeb10abb4d5a0ad30230e7bca57ac34b07514. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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/QZES82097781.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ff1fe2d2e4609016de7d95c2692a3bf7cc70a591036befdb8c91b3604f15a2b. Chain 2 (Bitcoin): anchored in block 958774 (2026-07-19T20:03:27Z), 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/QZK6L2287076.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae3e497a5161bbb96b110a40f7e3dbf7a3cc3bb95fb1d697224e34780dc6f1fc. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/QZES52326774.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x127d08069adde003a98c90f07d3e51aff50ed082c4bfdeb73946d5f2b8a4c2ad. Chain 2 (Bitcoin): anchored in block 958473 (2026-07-18T00:52:36Z), 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/QZK6P2363427.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae3e497a5161bbb96b110a40f7e3dbf7a3cc3bb95fb1d697224e34780dc6f1fc. 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/QZES52326774.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17b4341c722b3412569e69d7212954314ec159cf75bd436aa3a6fab265631fc7. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/QZK6P2363428.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x063fcd267ea113fcc275bd63db2769950e21c85c4095ee03623afeb7bfa9b95a. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/QZK6P2363429.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x269f233a24a7f98be0ccb27cd4df570df658ba24bc02826ae4010b55a4f10bf2. Chain 2 (Bitcoin): anchored in block 958242 (2026-07-16T05:02:52Z), 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/QZK6P2363430.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82b75ab6d37ee127ce2cc9cc552a0ff559ca8cc847cff10db557f86548f8c1f6. Chain 2 (Bitcoin): anchored in block 959009 (2026-07-21T13:14:47Z), 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/QZK6P2363432.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c2976d882b402041a51f17f9fa4df2615694d5f9e4afb24a97157ebc9046ecb. Chain 2 (Bitcoin): anchored in block 958905 (2026-07-20T16:14:34Z), 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/QZTB22383899.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7701c50adf2b410906de584a9c5fee096bb795ae30c26c757f0d862d6b5f8f4. Chain 2 (Bitcoin): anchored in block 959076 (2026-07-21T23:41:40Z), 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/QZNWX2418528.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbfe08c03c5e6f1af9ec7d46b8414f6f992c3db0caf81c6b2102125803aeea5a8. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/QZZ7U2495167.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b2447b778313da9ecc65637a116cfece2b0864cd93bb17cc69ba4b4454bb7d2. 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/QZDA52589504.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33b7f7084a6fa59752ea34f4408760e60874881be96c42f6192971e54ce74a40. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/QZWFL2592811.