thumb|upright=1.25|Main sapphire-producing countries Sapphire is a precious gemstone, a variety of the mineral corundum, consisting of aluminium oxide () with trace amounts of elements such as iron,
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 0x9fb80d2d570ec67e8e95efb68dba3e28551937a266d2c218d97e90e6b235117e. 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/5a28bb38-7c6e-4014-9ef6-85692e5dec74.json and https://artists.proofprofile.net/proofs/artist/5a28bb38-7c6e-4014-9ef6-85692e5dec74.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 0xd8369ed59bdf1aba572ce80b2be40d7a1e9f8f3ff660ff181ba7ef410009df57. Chain 2 (Bitcoin): anchored in block 958476 (2026-07-18T01:26:56Z), 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/QZTAV2436424.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7cb9352d8f9e0ff4742f1c93a511038b27141c1c737c347ebc948e25078d5514. Chain 2 (Bitcoin): anchored in block 958771 (2026-07-19T19:27:18Z), 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/GBARL2001372.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1b34abae4b2af87ef27e67bbc43c7d3f9ee718795e859e04f04c34375989bfd. Chain 2 (Bitcoin): anchored in block 958917 (2026-07-20T17:53:56Z), 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/GBARL2100383.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef27d5073fd9afe6eb4831fc3d8a3b1eb74ba9ab26cb111e59688f8f12fb4e11. 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/FRX872114496.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1849c5964b9f02391b808ebb69ec4afb4272cdb6d5c2ea51dbfa865eea87cc12. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/FR96X2259016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92900ffb829176af87f4b5006b306f6b87add8fc5314166b506de63d9d7c770f. Chain 2 (Bitcoin): anchored in block 958901 (2026-07-20T15:07:00Z), 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/QZNWQ2201733.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9524b5836199ef7a1bb7aa9c91d29a9d1908c51e561cba13390efa5d3916409. Chain 2 (Bitcoin): anchored in block 959008 (2026-07-21T13:14:05Z), 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/QZES62368883.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x228355f8813448a8cdaefa00cbe1576e1e43367429310b659d2b8c19aaead1f1. 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/QZNWX2300425.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87a58728255df3093038f17266603c9ca1b3e768ddd7d893ebd2b6fd1b2ed1c0. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/QZTAY2390976.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2265aba7c98f31ca5370f111801f52896d62ee3f6d389c019152faea334598b. Chain 2 (Bitcoin): anchored in block 958576 (2026-07-18T16:22:28Z), 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/QZHNB2450779.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe27145da4ec78002ebd9f21b079378dbfa6c20409b043b536a3d85a11ea72dd1. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QZTB42439552.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55a3a23c3b9e20ccc349ad9a2007dc89baee52bbdda9bbee39e97dd232890a2a. 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/QZNWT2441496.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x621e486ded127b29fadb2307cae05b9dcd9da77bad0fdc59ffed158d82b102a9. 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/QZHNB2450780.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a55343e7cf02665edcf88d2dc09eaadff95b21c27313d08e6c87d71149acac6. 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/QZWFF2496052.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c74df0d48f86a9900ea016887ac004b1df01ccb293d4acbb309a062391b6564. Chain 2 (Bitcoin): anchored in block 958600 (2026-07-18T19:24:05Z), 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/QZTB32434923.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x177e46eb942f1323d1af61537748228c7850269c49dd94b2b57177b087bc108d. Chain 2 (Bitcoin): anchored in block 958523 (2026-07-18T08:54:12Z), 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/QZTB32434924.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xafb92df437bc5320a29bcfe67cb693eb8f02fa1954b9a2436ac9560029552abd. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/QZZ8A2528123.