A cactus (: cacti, cactuses, or less commonly, cactus) is a member of the plant family Cactaceae (), a family of the order Caryophyllales comprising about 127 genera with some 1,750 known species. 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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa43bd207fd2631dae9989770391e8e1f132004b55443b18f4e76f4bfb7b23793. Chain 2 (Bitcoin): anchored in block 953423 (2026-06-12T21:20:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/b0c0d750-c736-47b7-9e56-dc489c4d2130.json and https://artists.proofprofile.net/proofs/artist/b0c0d750-c736-47b7-9e56-dc489c4d2130.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 0xcd4ff484e639fbbdd0ed902c63064c7815bb29e1aa67cb50a1c60e8c1278439a. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/ES5062200804.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80bd25ee0a75a7608841125080686da0126fde0626336acba4a23b9c992fd983. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/ES5062200801.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0f323b9dcf8b58ff18f4b8b47abc9e03fb0e18488e4c53b485b733ab0b9225a. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/ES5062200802.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3977a36bd0de219c8256a319b08ac257022b6e8772839bb05a3548cccc235a06. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/ES5062200803.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe864315b8ca1800f4599097b0b9a26cf57563163e663da75660b702396a24c63. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/ES5062200805.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f00fa5270f02aed101317e4b55c75058db712dc1e8d0c224b58d93c71ea73e7. Chain 2 (Bitcoin): anchored in block 957052 (2026-07-07T14:50:41Z), 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/ES5062200806.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ae0e721d587e165fbd54357bc945a0f2d2aff566a2e9e0a52b8780a01538305. 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/ES5062200807.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc4a5d19fb26e994cf9fed3848de7bcc556f93e9582b653a6a46be316a9c3932. 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/ES5062200808.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53d8e0fbe4e866dde10767851509843099156431ff5d679a9253740f037737c0. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/ES11D1900252.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x417264de88f58eaad1308b8e5c046c5104d98f3d9150f814d56f8147af1125e9. 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/ES11D1900254.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96f61fc116f6ff09f4978465fd2ad7425cbe9528b9d68e5ceb8feac8b4c00a93. 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/ES11D1900255.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e88724fe387895d43b800e5460e4f852468418128ef240a192361f49c88d8b5. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/ES11D1900256.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x024d869695d55e57e1487fee4c2f0ee75f2b2c75aa9ac3c26770486ba89322df. 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/ES11D1900257.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79cadb841d2ae67047e72ac96caf7a867fd3ce047eff9b1376d96bd6ef5520f2. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/ES11D1900258.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8bb20cee8348402bf6ed99f21961314fe079661b85a660bc84fefbfb23ca8792. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/ES11D1900259.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x361ac1816dd15b341cc1de39fafb41e696c5c3a67aa8e82c41fe1bb7e06b6c84. 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/ES8241825305.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30fae3ab0411b569d4b75e9b44d9982b7239b50cb351eff2a267bcf5dd55fa9c. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/ES8241825303.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed105bc53befb5f4ef3dc84b1f45adf9c33ca9aeca6fae44cd1bde633ef3e5de. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/ES8241825306.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x841f2fcdb9b4c4b155fb48e0e3e471dc50e832db43ccd8e96350a89cc0e1d59f. 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/ES8241825308.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01b69ce17289e4a5fe4a2f0b2990d8fb09538ed925ceba429a6a3a0a970ec054. 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/ES26E2400030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70c148819ffa89750df911e3afa0814ab8755691a85e5b23b8090f09c73de96a. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/ES5062404701.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42de5e3a0ce066f0d70bebe610096d90a688bc967e0da0518eab2d38861a6ec4. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/ES71G2401560.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f283d0fb364a53f2c57e42063fc9fc6ea97da183cf8abe6db52f230621c4360. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/ES5062309501.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54a2f44213bd0df97c1912dbbae04950394d508cb5d30710689913eeabe0351f. 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/ES5062302901.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf40a204925b194ad4a182e4524d982a1e5fa6d5016e2b17073d74349d19a64c5. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/ES5062301001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0f323b9dcf8b58ff18f4b8b47abc9e03fb0e18488e4c53b485b733ab0b9225a. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/ES5062200802.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd4ff484e639fbbdd0ed902c63064c7815bb29e1aa67cb50a1c60e8c1278439a. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/ES5062200804.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6bfbeb60d731cf91df4def307250edbcf6f943de332ccbc55a71a13c0267c08. 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/ES11D2000425.