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 0xc2b80893171fd0702ef74275d241d19e168ba6c9a38ecf2c63d0cd08c9408b11. Chain 2 (Bitcoin): anchored in block 954717 (2026-06-21T15:47:51Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/f577cd88-a0fa-40f0-8dca-ceb640b7beb7.json and https://artists.proofprofile.net/proofs/artist/f577cd88-a0fa-40f0-8dca-ceb640b7beb7.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 0x05fa4378c24e10ac7b1db620971ded8bb7528763bd23964fed0bf7ce18da5188. Chain 2 (Bitcoin): anchored in block 960160 (2026-07-29T22:48:59Z), 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/GBCKG0500387.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5f5adbcf5bb2706e999afd6b80aa216ba53a42670ef86dae437fbad3b9bc49e. 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/GBCKG0500388.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19381a6259480f83aaa262169e66d69ff1446f83506b06477ea77d80aad3e525. 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/GBCKG0500389.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98e0da3610b2dd94037689e68eb3bb73ead7167f7281275f856fab30048986f7. Chain 2 (Bitcoin): anchored in block 960379 (2026-07-31T09:25:34Z), 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/GBCKG0500390.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92b854054fe3769d2acacf9019d8219372227ba7b6fd52c9cb1cf48181e3c5ec. Chain 2 (Bitcoin): anchored in block 960389 (2026-07-31T10:20:10Z), 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/GBCKG0500391.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d822b81378e1eaf8b0422f04a989db0ca70aef219bc5b19635bcb21e4cc193c. 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/GBCKG0500424.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xccd256074aec6d0424523b7a524b0a838cd72a5ace0f0bc902d98860eff251ae. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/GBCKG0500393.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeec54df2ee9f11acd5de8d3dc5fa45d3c3f345dd9771043ae5fe1a9b4e1bb830. 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/GBCKG1500129.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x781039fc1df8df21b1f4a9fbefadebb0727f3e66d96cfe7ccafaec85a8aaeccb. 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/GBCKG0500394.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b1b8290594f865927aabadb57135b62506513ca2b47a7340d5a7a2020e4d451. 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/GBCKG0500395.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab0e243e7a17e7c5b4f542cdeb318a399bae22fa46fdc2159e4d55bec4290c29. 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/GBCKG0500396.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39b200f0e1c1368af52ed56695cee8e0a6ed587efb3cf3aad1f074e9d3f0cb2d. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/GBCKG0500397.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfccf32915d2c058eafdfffa68be9d3c4a1db51cca1058ea546e393038cc6b28a. 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/GBFFM2256383.
Xian Ying: Guzheng -The Art of the Chinese Harp
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2fc57873f8801c3249f11ba8d00e737472781be2525c9145c8d93b36fcc0b4c9. 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/GBCKG0502164.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd028b3e7b991283dfe94be8f74dd3c10b60a5808ea2238a65b54cfc7256da11a. 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/GBCKG0502165.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1cef837ded1cac6efc566f3b520b5c7c534d2df9210855bbada6bed41778b057. 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/GBCKG0502166.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98e0da3610b2dd94037689e68eb3bb73ead7167f7281275f856fab30048986f7. Chain 2 (Bitcoin): anchored in block 960337 (2026-07-31T02:51:48Z), 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/GBCKG0500390.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a9164285e41112f63c36e48f62ef747fa8a7c0ecdc95959faf642ee6cf6405d. 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/GBCKG0502167.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1fcca4562507219559799114b0a762f34833859e648abae8a2488be3257e810a. 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/GBCKG0502169.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xabfa65727ad4b62cb82b84086996651f12d4660542974bb31da94e4805369f1c. 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/GBCKG0502170.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x598f50d3504846471af8360730e153db25e7ecb22c7baa502c9fe26626557ce8. 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/GBCKG0502171.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x353cb1b292449991e6d4aec62a99acf3099300019413b29c9ddd6cea20def023. Chain 2 (Bitcoin): anchored in block 960294 (2026-07-30T18:46:00Z), 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/GBCKG0502172.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66d2c787d076aa4fde5c47acd02aa51eb5374601adc7a6a2794170e6f713b14a. Chain 2 (Bitcoin): anchored in block 960376 (2026-07-31T09:09:19Z), 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/GBCKG0502173.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3930598e4f66182bfcc9ebef28e5f57b677ab4ca9eea47b1decdbf5eff21f67. 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/GBCKG0502174.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1ce604d63e6992740c9f27eccf3995e2b379d147a52b5760ec7b1e0ee056fb3. 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/GBCKG0502175.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ded2fb50a9a280956f2bedb2154150640a10e5967cdf1c26c2eab8035779294. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/GBFFM1917314.