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 0x4bb753f490a660ce87d981ec562d8103761b9b23cc325edf83b9f44eaa58ac8c. Chain 2 (Bitcoin): anchored in block 954516 (2026-06-20T07:04:44Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a21f11df-b2bf-4ba0-8054-0e92c9f71e76.json and https://artists.proofprofile.net/proofs/artist/a21f11df-b2bf-4ba0-8054-0e92c9f71e76.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 0x36fee3c55b6de0a65a2392a489481dd2a3f30bade82bdc8721e0424b8824a419. 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/SKA012100261.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21af20f07aba05e51a0d196d0e28eaccd0eac8682860447fa2aa8fd675a6603f. 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/SKA012100110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce9762744757bd31ac1c2c88371cc0d60c518db96cc740ccb5a247fda4ee1cb6. 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/SKA012100165.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96e0c4cea65d4ed5d8fac5d9e42794b9b1cf00116f10a86a8d179fbb39f386a7. 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/QZNWX2192708.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x592957a958c590c3702af0d2b674ad07c6d45baaf128372a0d2996ce4785f87c. 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/QZNWX2194715.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcdd6b86edc1b3037b402cd44f6b9d4dd1c00db9c856302e461d1d0f5044641e1. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/QZMEN2133973.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85c14018915d315072be5ccd69975e68f0d3073f217f90b824c7d0a6e435a2b6. 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/QZK6J2149534.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e43b976bb95fcba80cf2cb9f547d80ff2064cb78ab59d5a38a3e8e0b9d3d8ac. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/QZK6J2149535.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x366799ece03c96bf73c16cba860e3afff24afce6827e3eab707e480cbca40564. Chain 2 (Bitcoin): anchored in block 957012 (2026-07-07T08:27:05Z), 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/QZK6N2190137.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a48a55aa867b3d30afa4bb519747be938aa3f0af94a6015b64e78fedffdc52d. 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/QZK6Q2137184.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad5dd29bbbfe0ba9a282fda77fd9a52d0f7f1db73724046fb45a1637fe1ee841. 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/QZHNC2113145.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0570e1db05ea866b98b56726094efbaad195d16c415a43805194ebca37a081c0. Chain 2 (Bitcoin): anchored in block 960193 (2026-07-30T02:05:19Z), 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/QZDA82143471.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd1d1d0009ad562140fa1f7cb271d3c4597c448bc2cee4ca5145c813f6e0f423. Chain 2 (Bitcoin): anchored in block 960259 (2026-07-30T12:51:24Z), 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/QZNWY2068309.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c48efbd5c8affba9a239757807a843c49385d4f5f2e974fafda9c8fad45addc. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/QZNWR2023180.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0188d0abf309ae430fc3f4284d05a87709fe02d8bfd7b8bd835a4700dbd8857c. Chain 2 (Bitcoin): anchored in block 960296 (2026-07-30T19:11:09Z), 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/QZK6F2058863.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e344a6c5eeed778e9a598f28741bcf03ec59c50769773a4ca884ff3734ca754. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/QZK6Q1964797.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03ecb2d847fe6f877c03e185a6514788dd5f8f5d20360a296a09a5b0043786bd. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/SKP592100100.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd23f1bf1656fdf560d8800b222c9011dc7650b9291da1b8b9b384d63a8bfd06d. 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/SKP592100101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4d31bd2f0939ab1be15784a6603c6b2ea9555e3c85350fe2e267ed53536a10f. 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/SKP592100102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e6a17d96f8e605175236b9022edbd73f81dc69cc0d178d97fa2ebf2986394b9. 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/SKP592100103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a482ec14f13afccf21753ceb37c669f811d69bff061368ae567debede8e83ab. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/SKP592100104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6626c8368d9541313ef849b926c52a27d0d5519547587e13b18c57930288d5e2. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/SKP592100105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd59e21bb00ed29aa0337ee67e0cbb6cd3cdc00628d27e5f17994a0dcb91dc658. 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/SKP592100106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4f37b4883a2c9b2f68cd314a8ea75d6c8f81f59767f16b5c2d3e8591e277467. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/SKP592100107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfcf18d0640e9c2a3d06c659b470733fd723b69236fb504d0bee3dbf418b4d352. Chain 2 (Bitcoin): anchored in block 960370 (2026-07-31T08:38:45Z), 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/SKP592100108.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80f41131a8fe1ba02226806a925e0b8697a49f26b3641f4ef5d0d641b148efbb. 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/QZNWZ2059447.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe14699720681be9cb9026603fd188b729f274950f6dc12226e1fc4080a52bf96. 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/QZFYZ2121316.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf14140b49866c10b7c5cc829a1f511e2ce140587bfa33e41233c791da25953d. Chain 2 (Bitcoin): anchored in block 960503 (2026-08-01T03:41:24Z), 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/QZNWS2012752.