Limulus is a genus of horseshoe crab, with one extant species, the Atlantic horseshoe crab (Limulus polyphemus). One fossil species is currently assigned to the genus though several other species have
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9d38306fc366b5a43b494e37ec1dd30a8a223d42d42d5526754e9083327f46b. Chain 2 (Bitcoin): anchored in block 953770 (2026-06-15T09:50:11Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/c516c06d-7454-4e84-8b24-d3e67902565f.json and https://artists.proofprofile.net/proofs/artist/c516c06d-7454-4e84-8b24-d3e67902565f.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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0db44ab0f2873deeea0293114f3121c564859afa22b1a0a60d512184ed947a31. 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/QZES52477966.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92505804a7d5f1f667dd84b7816920a99e664ae17024fb95ebd5269089502ad2. Chain 2 (Bitcoin): anchored in block 958517 (2026-07-18T07:54:29Z), 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/QZTAX2483077.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64fcd192492ed1864cbd1c7a9a27b5f6253b27e336f1825f26cb9b10c609a33c. Chain 2 (Bitcoin): anchored in block 958582 (2026-07-18T16:47:25Z), 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/QZES52540425.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a2155b5db1f6e3060e4487c4169130ee54d8a9a1976483780b67aefd0a4d6ed. Chain 2 (Bitcoin): anchored in block 958622 (2026-07-18T22:58:55Z), 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/QZDA82565681.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67341ff1e6b1f9ad224f4c06f2e6aa5fffbfafd879edcaf4fdb9f88eb1478baa. Chain 2 (Bitcoin): anchored in block 956728 (2026-07-05T01:43:49Z), 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/QZES52504776.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf0cc5828ecd997f7d08227e5ccaffdf60b9c2c27cfecb31262598aa7ad650de. 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/QZK6M2548624.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb36b7f9856afb5243adc0a13f4a1e240a7db8c50b2b364c25c870cfe291ae71a. Chain 2 (Bitcoin): anchored in block 958838 (2026-07-20T09:30:42Z), 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/QZRP52563270.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44f77f528d6dac1906df2a425bd4d5b58a26d07f63b67fd3df83d28389b8de34. Chain 2 (Bitcoin): anchored in block 958793 (2026-07-20T01:42:02Z), 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/QZRP52563272.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa029dbef952c1f1dbf7a38b153aacbf0d11a1a973e4d621bce1d3c89468fbf0. Chain 2 (Bitcoin): anchored in block 958846 (2026-07-20T10:01:40Z), 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/QZRP52563273.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8ef01a7918cd980c53213b74c079bf0db5faecbc3b47364a179e1c4884d1ea7. Chain 2 (Bitcoin): anchored in block 958917 (2026-07-20T20:03:06Z), 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/QZRP52563274.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05321e5280bb384aafc644b34937c061333be47893d5b2ca2aa84b6835e13684. Chain 2 (Bitcoin): anchored in block 958827 (2026-07-20T07:32:34Z), 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/QZRP52563275.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4873f40e86a8dbf3980d0628380db325fa222306d9cba28f27a45b9d58c9eee3. Chain 2 (Bitcoin): anchored in block 958876 (2026-07-20T15:01:09Z), 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/QZRP52563276.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa842a85ee688ada402cd2cfab63b51058e69b410d86704bc99fcddeda28a2f97. Chain 2 (Bitcoin): anchored in block 958913 (2026-07-20T19:21:21Z), 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/QZRP52563277.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x568a98a93d63dbb4cc660aa78f2a60a06cfc530a3de201995533dd43080b1eb9. Chain 2 (Bitcoin): anchored in block 958857 (2026-07-20T09:45:25Z), 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/QZRP52563278.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1aabc04f0c18703e4489f564bfba1ef3421736dad31a17b0206a72281d5269da. Chain 2 (Bitcoin): anchored in block 956790 (2026-07-05T12:31:54Z), 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/QZRP52563279.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcbe1a03ff4d9e4dbf047cdd2242bb9f4746198d49ce2f213909417a53f6ba7f2. Chain 2 (Bitcoin): anchored in block 956776 (2026-07-05T10:59:37Z), 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/QZRP52563280.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa64e99de5571c7ee80154f5681d2cd506abdaf1cd2513eb773c185d03fd0ee0c. Chain 2 (Bitcoin): anchored in block 956790 (2026-07-05T12:31:54Z), 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/QZRP52563281.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d8f658111c97f20059b9a6b42272361debf7a50bacab5192d7fe3ece15cde16. 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/QZZ7T2568943.