thumb|Stoma in a tomato leaf shown via colorized scanning electron microscope image thumb|A stoma in horizontal cross section thumb|The underside of a leaf. In this species (Tradescantia zebrina), the
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 0x3b3e05b3334eaa045fb2d0ee3ff4105a1b4961f3de7b55dc0edb7e96818da8fd. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/75d9cf86-abc7-4033-8021-d480a53a4729.json and https://artists.proofprofile.net/proofs/artist/75d9cf86-abc7-4033-8021-d480a53a4729.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 0x383e5bea7482f25e35526a98f1e92b71398cc2c7d62c2e58cbd6d1dd1ba7cf9b. Chain 2 (Bitcoin): anchored in block 960150 (2026-07-29T21:51:49Z), 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/QMFME1304621.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a3848a9453f8d537d0d414a4d29db5b2f3ceb1384aee5e183b52ee614ccc3d3. Chain 2 (Bitcoin): anchored in block 956891 (2026-07-06T07:16:32Z), 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/QMFME1304622.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0060092b5c57524d9be2cb381eaa58945d660043ae81616f07b6d9674fc93117. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QMFME1304623.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07ec5272dcbd659e513f21d2289e9c374fad77c2113639361d3e4fe93b0ad686. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QMFME1304624.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd23034cae2b6fd5eecd091c977b3f165582eedb024c638a6b07cfcc67c586a69. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QMFME1304625.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa574b39338a663963cc81d5d980bb581efe220cef5b05399e0960d7e95a815e5. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/QMFME1304626.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5eb030361f08a40894b7c175c00b6349352a594d027eb3288c53ab1a7d243456. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/QMFME1304627.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d1e47fbcf38df358280d2b4b5e2537ba425c8d92bd89aa1d9a89cb5bc380355. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/QMFME1304628.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b5d9b34067f8f7d603d68c12e80d524abb5e7dcc7b007198b32fe15369c1e98. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QMFME1304629.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d9ac6f0f54761fed99ba9b5332b9ee3d1c8f1559eea889c39196409898f26f8. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), 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/QMFME1304630.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9b04811f4d895298992ebefc854159a3726eba7ebfc7069a67cd253f60a4244. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), 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/QMFME1304631.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04eb5ccad4fd973cfe7779a31b7c4ec6162a52ae85ef51cda66c21bfb54881fb. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), 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/QMFME1304632.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5b420a20db355b4fef6a353ebbdbf8b649e12b67eda1fbb28b1a662ce514753. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QMFME1304633.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x710d71bdceb4bc0b11d2db83f7a0e9c32769a7265357a02499634739eb9fa885. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QMFME1304634.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8458ae052e14fd7a1e8a8cde19d332e3ee7f7bf83c1c721c6016b648abbda2c2. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/QMFME1304635.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b67b72964f83bf528b1d4ba090e19c4b27ca321e942338a933adcd56b39abc5. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/NLW740600055.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47119db82bfb19d5430ce6abe02b21fd852f760ad4730b2a1f167ce85e14a51c. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/NLW740600056.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x039f8a6a08b7fdabeb21b13d5931cba66d81c209b4e1eb0a3f4edaa46515e0f3. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/ITB551413225.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b0ae402501b4e8b0c970459ad7a196ed989d853e94840b6a564018d34390552. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/ITB551413234.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd85090aa68e5c20602a5f5cd1ba1ab5ea7d3056a9c1a53070f93efadc2a3b0c4. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/ITB551614220.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf589926fa9f89e11d9565d1f12eb2872802f032572e00b89d1500cdfbf23f53f. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/ITB551614224.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25cf6c8a5f9c91d223a54330a188de6c71461456d477b85317edeeb8adf986ad. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/ITB551614225.