thumb|A shoe using hook-and-loop closures Hook-and-loop fasteners, commonly known as Velcro (a trademarked termhttps://www.nytimes.com/2019/06/24/smarter-living/how-a-brand-name-becomes-generic.html
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 0x7a7425bfaf115b5c7de1941847637fa1d16228dda5d1b3d32a029ecba5a3b309. 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/39a05021-eb6c-4103-837c-0d0dd70527be.json and https://artists.proofprofile.net/proofs/artist/39a05021-eb6c-4103-837c-0d0dd70527be.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 0xf36fefbd37320ecba69f06a917245250076ae1e6810a7badf5a7bd4d8710546a. 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/QZHZ52248738.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ea93323c17b78784eabd3c0a135d0f4a8eaadb0d746f5b0309b5079161661c9. 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/QZHZ42108948.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c81b37ebd44d394bd3e3d27c5d213ff669511598378c453e9777f6860e0a296. 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/QZHZ42108935.
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 0xa178db46b699ebf4cdfa21d0c894e9eeef77772d5758894a41f3a1dc5889b2b7. 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/QZHZ42108937.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaef0a566db7da7971646a8ce678ae6f7157745e5faa595b699f872b6ac56c64f. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/QZHZ42108938.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd36adef5b3338a334c6cfc99329324d72d76e9654c9b7f74e8cd615c5f21d62f. Chain 2 (Bitcoin): anchored in block 960354 (2026-07-31T05:48:18Z), 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/QZHZ42108945.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0d696e226fe8e9de7434f712d19b5ffdee5cd8cc29848717bc21b59b9de9e3e. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/QZHZ42108946.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc438c94b2289ed23da8e82795728a8807aa6736e32535a52e5e079d3e93cc62. 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/TCADQ1876695.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97168b4705243783547b722bbc883bafada8386f7986a4d07835cc58818cc7cf. 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/TCABS1358892.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdeb7b0b1afd317eb2e60f6d7e4e9ccb630ccfda68f8231a5e11f9cad988f44a6. 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/TCABS1358894.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8257b2763d5f959e24538c606409f328118740e84804dc5793716078964f09e7. 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/TCABS1358898.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda0a10a47e65e2ccaa1f06f318de759dc3b76da3917a52dc15a1f858f094696d. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/TCABS1358890.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x838bfd45f3ddfb96ded0977ac457ed64b504433222f4f439bde58c80a58a17b8. 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/TCABS1358891.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31ce129454d3b69e85643dfadc8aae85c29f7552a548a0056fd225808201b813. 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/QZW9M2472856.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d4348201b119603d87891739696c75733482bb26eca86c22adb8acf3b810036. 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/QZW9L2405139.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x112dcd02bd3a2db61b67dd0e94db8d025e36021a0823f8f161904970f23e7d46. Chain 2 (Bitcoin): anchored in block 958042 (2026-07-14T18:24:07Z), 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/QZNJZ2477502.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xffcd9682ef92b02efb91dda0d51e9d5a37b8fbe5c67db0c5090c3da2db699914. 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/TCAEL1906724.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90089b1af56e6b0797943d5b8417c0ded07362cfcc35574052596d6fe97094ce. 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/QZFZ31941177.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6cc8911762a062794c625d49399915d16919468e866cd54e4decf449e18e0892. 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/QZFZ31941178.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9cf94cdfce9263ea7960ff66bd19ec0851c32f21841bb062c513ffb4ae08db15. 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/QZFZ31941180.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e4444a169774923342ae169441433330a558d9258b8534ce4bb0f5464f13746. 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/QZFZ31941181.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xddf560b69f6ee94602a1ee37fb28e23664dc0a9280857620cfb3d56dc2dc47f8. Chain 2 (Bitcoin): anchored in block 957026 (2026-07-07T11:02:43Z), 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/QZFZ31941184.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81137ee6ff10a0b2dcfb05e0819deca1668322d0f3ef55fe8b4649eb0ffb8c81. 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/QZFZ31941186.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf52acf45d7e0122a6ef95e441891adac5d54c034da08ba2744dbecf2cf084d67. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/USLZJ2379560.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe62e54cc1616dc49033fed4b56546bc579ef54e0d22ceafa363a5eb8bed88f50. 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/QZTVM2210328.