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 0x8fe333d0aeb09e3e8b4b660c4f4223f5443e07a0f678a1ed5f6e39267b9ba98c. 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/8f28a76f-efd2-466e-b96f-7987513ff62a.json and https://artists.proofprofile.net/proofs/artist/8f28a76f-efd2-466e-b96f-7987513ff62a.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 0x520bfb02b0caa6e2997a0c854bb0a83e63efd13d17c8f05588d6a745e34d95da. Chain 2 (Bitcoin): anchored in block 958395 (2026-07-17T10:10:33Z), 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/USCGJ2406932.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf59e224a8094fd7708cfce1b8c4f6e4064894afb5d6ad862809156320885a428. Chain 2 (Bitcoin): anchored in block 958362 (2026-07-17T04:32:48Z), 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/USCGJ2422435.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0fa914c56c3f2b125636801c41be3d78637393b5f5d1ca49983003f0a2de46de. Chain 2 (Bitcoin): anchored in block 958765 (2026-07-19T18:01:47Z), 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/USCGJ2422436.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f533bc5af08bfc8d779a3e255c06c15a4671800a93eaa40bddb9232baa647e0. 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/USCGJ2422437.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b4eeb9ace747f791bf6d57804336548ad9287ddd3fb779297ac392c7ada698d. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/USCGJ2422439.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd37323fb13da7ad3e42cedfc9eb26e30222f85a51a98b659328d89a316c76265. Chain 2 (Bitcoin): anchored in block 958955 (2026-07-21T03:03:40Z), 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/USCGJ2422440.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd97c2ca7183d5460ab7adf10f650c1a8de775eb8af18a447062c61e19d7c3156. Chain 2 (Bitcoin): anchored in block 957754 (2026-07-12T21:26:22Z), 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/USCGJ2435402.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71f7030a9c7b76f45aa57cecd8664e0a2db580211d6ef3e82a7bf6a00e9a7a94. Chain 2 (Bitcoin): anchored in block 958617 (2026-07-18T22:07:13Z), 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/USDY42465322.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9633da51bcf29efa4a21517f6d6b89f609c7eae4de94aaff5f20f88b4f233820. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/USDY42465323.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce7b179fa32fb21ade87386b859bc0f742a4d4a4f5464e3d9ddcc20e7cf4d643. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/USDY42465325.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d8fa8d534ac5132f9ff7b85a3dfb3fad6dd1ece55d2273327e0a2d9cdef733e. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T02:05:55Z), 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/USDY42465326.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02579f6253c9c386da02eb0f28ff4e019ca66ea3d47b49bcf2c9204323693da4. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T02:05:55Z), 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/USDY42465327.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x742a908e75efa507d1f936d9e28cce25e47eb67989340640858fcb97753de989. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/USDY42465333.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e5b45f1421e5a53276a089c841585bee01816c6a572456aa483fb8586c36e71. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/CAHQJ2559723.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x813e55125048cda62081da54df66f23800da02eb1fe29dbc42c7f966516df58e. Chain 2 (Bitcoin): anchored in block 958985 (2026-07-21T08:39:15Z), 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/CAHQJ2559725.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd0ccbac54bd6a8960723cd8415c5024cce823a1b324a786b930809dfda50709. 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/CAHQJ2559726.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69f6e80789802f460d70209abc31ba569db51751ee0c4b23119e44898c45c236. Chain 2 (Bitcoin): anchored in block 958271 (2026-07-16T09:16:54Z), 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/CAHQJ2559727.