Eshkol () is a Hebrew language word meaning "cluster", usually of grapes. When not related to the Hebrew Bible and botany (where it can also mean "raceme", a region of a flowering plant's anatomy), it
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 0x32200b2a1f56b4e03bd8d55f09b66c20f67facb67cdabeba59de0928206dd0ed. Chain 2 (Bitcoin): anchored in block 954039 (2026-06-17T03:00:41Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/3e8d1339-f8fc-473c-889b-9ea4cfa5277e.json and https://artists.proofprofile.net/proofs/artist/3e8d1339-f8fc-473c-889b-9ea4cfa5277e.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 0x55224cd095afc06436da620384e1ee504351c2058211461524987347e5a24ac5. 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/USCGH2479867.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71017c95d53d86a626364bb9f17ee631ddb222f5b7e42ea316a030065521777b. Chain 2 (Bitcoin): anchored in block 957043 (2026-07-07T13:52:39Z), 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/USCGH2479868.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8bbbb3095c16756fdbf28cf4ca4460245abc59f8748ac88286969cec626495f7. 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/USCGH2479869.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8653016d4751700cf4e2f70bd6676a909a422be9840b1c5306c7f048f40132f. 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/USCGH2479870.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd29f9a2e930c3fe8ed6539fa6aac29c42407a034202a16f53aa3d2affa6a588e. 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/USCGH2479871.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9580f76a0610f71c32376d9d7086125fef1270ed72378853980fd60067eb7399. 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/USCGH2479872.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d0b5caaf8caa66a729227e19b7e38fa2550ff1490fa879f657afa0185d652ab. 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/USCGH2479873.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66cd004665723835a4ddf3885ed3ff958f9b1470ba75ca5aba7b943768ef4457. Chain 2 (Bitcoin): anchored in block 960337 (2026-07-31T02:51:48Z), 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/USCGH2479874.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0caa1a35c3332e6f04e49d61e593f2eab6e0653540045606e2804d8f2424aaa0. 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/USCGH2479875.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7baee0bef5ecf141effbf1774b522f9a06d89f0d1f236bf1c4247a89e71c1554. 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/USCGH2479876.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b230b055d0564b2cce1f4ce775c12eab76b4864210d63e69807f893b4a3d361. Chain 2 (Bitcoin): anchored in block 960296 (2026-07-30T19:11:09Z), 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/USCGH2479877.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb262a6178eb95ec08ffad0e0d4fb2ce1d2fcf88b1a1976c37aaf8b1c7714d23. 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/USCGH2479878.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce98bfdff9c8f114cd8113a852d194f0bdedfe45dadf8b36b9e0a9872bf51cb4. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/USCGH2479879.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc19e14150a8043e601aec910d41db4438dde58b3c67eb9665afe0a89397cb0b4. 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/USDY42341276.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce496f323edf43e4e1b3f6c3777fcc64aeaf4c6e71d61f53cd298a5ba996c700. 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/USCGJ2277957.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d7c528df642f1e2421f5afcc488ba1ca8edbf9aae5b6678d8e790da4bc90138. 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/USL4Q2144063.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16800df8ef79389008b3270ec51fcf5a3ec4aacefe41ed048e82dd55ed71c73a. 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/USL4Q2144064.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63e39de3e93acc91cbf3df896e1cdd1035acdd3bddc3f024aca4fe8df51a8077. 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/USL4Q2144068.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52909c862a191bb105514058d1ccf5ac5b7acf9be469f5bb557933ea23ae9a3a. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/USL4Q2144069.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96aee6eabc4c93b43bf80c76c21bf66c3bffe274402aea794fb3c45b7d28a399. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/QZNWY2492864.