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 0x0bb549fbcc7d79b07fcb24a32dd96ef2264ab999af083d66e1491bf0f4750e27. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a5c9b328-55ec-4f05-80bc-718ff2454842.json and https://artists.proofprofile.net/proofs/artist/a5c9b328-55ec-4f05-80bc-718ff2454842.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 0x86c5217fc0ef3651f81641d2a0152f8a02c123e1166ffced958d1de25ee7fc6b. Chain 2 (Bitcoin): anchored in block 958455 (2026-07-17T21:28:36Z), 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/QZ5AB1843389.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9274d1e90377b97b0d8596fe61e668061f3dbfca6556262dc1afdfc70f571b4b. Chain 2 (Bitcoin): anchored in block 958734 (2026-07-19T12:54:58Z), 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/QZHZ42265964.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9948ede6cf8ebbba8ec7edecd1b6b7fc80316602624f3470f5b173ee8392fe16. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/QZNJW2288641.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52112eab92e2333db7277a40b999217f37c2fc76f2dcde8c6aa5f549eb94bfac. Chain 2 (Bitcoin): anchored in block 958324 (2026-07-16T21:05:52Z), 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/QZ5AB2398953.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb81edbf067efdd53fef69c346dad68af41ece0b68a2297fcd25ddfe4141cef0. Chain 2 (Bitcoin): anchored in block 960303 (2026-07-30T20:11:13Z), 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/QZWV32355784.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad48c68d2083d3b9e1fc2b749ef504a7c6dd419a19904eb301fac6c1bf596e8f. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/QZWV32355812.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x135fd528d2a8f5b6b52878230643584041d3f3789348bda87db3ed84acb44b30. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), 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/QZWV32355816.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01e8bdceb4bf0d4fe296eb89a402f201ba698923e526e5fa83c528eb910be066. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T02:01:41Z), 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/QZWV32355838.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02f366a0dfd154db6b08a089b2d2ceee3462311fd0404ce7a9511d94900b1fea. 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/QZZ8B2397189.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x848d0dc6a25aceba92c3653bec693c58fc93e658fbdba82f84cb0b1f0183aa71. 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/QZWV32540791.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xadfc3305030fcf1cc3499d2e13f83e83bf726c88d27ffb73fa625cf65de39679. 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/QZZEB2398549.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1713fe9cfae9f74c442c887739dbf8590b93a0ee376aa1c5396365aec7900217. 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/QZW9L2309462.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd11f54c37a6389943e346d70158a1d8bb7f1a67f05cbaa15a49a3537bd6d9e0. 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/USA2P2339647.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60dcce51c4476663040fd3ef29906ade170f7306bf543c0be86d3df3012709aa. 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/QZNJV2399772.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd666b2f0680a3f32612e6e0c640d4697f03567cf2d91887e7115ed71cf4e2143. 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/QZTVM2251232.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xadfc3305030fcf1cc3499d2e13f83e83bf726c88d27ffb73fa625cf65de39679. 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/QZZEB2398549.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd209647d5d4b331535692198af05c66f0eb2e27b85774e84d3cc41e441d2cd93. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/QZTPX2361363.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c8bc5f7567bb92a3c8af2123aab5c1194ddf984ab4d3d4e912ed89f7d94d7a2. 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/QZNJW2359162.