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 0x34e4a9935b149b63a93e4fc27640f63a092b11ef6dfcbd7df657ac8f528288f9. Chain 2 (Bitcoin): anchored in block 954500 (2026-06-20T04:47:29Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/9d555b86-0421-4169-a4f6-15ede5f7817a.json and https://artists.proofprofile.net/proofs/artist/9d555b86-0421-4169-a4f6-15ede5f7817a.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 0xe298a3e22a48d79af5f99f0e24b2f2df80ff8ae8b0c2c01dc0be7c3d644a5b94. Chain 2 (Bitcoin): anchored in block 960258 (2026-07-30T12:45:34Z), 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/UKXN22203234.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b89fbce3e0d00ece6f847407b06cf14501003dc69857ed2fe7871b4eb9e061f. Chain 2 (Bitcoin): anchored in block 960317 (2026-07-30T21:35:24Z), 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/UKXN22263200.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb38ac4e5f930996e872147903e709b5385271e1a8893cc1de292ecfa64e9f0a5. 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/UKXN22263201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0f5fa7b686a5cfde9f03cf55fcc55fbef6399f66ba20c6b656545025d0447f3. 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/UKXN22263202.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf618edd3fb9c0e588e3f55b7cca62ade67e173cfa3deda75470739c082c970c. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/UKXN22263195.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6481f7bcd9907ceb815a7cc0b4d70704e3741f47b1c31791b00cb6f4600aeea. 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/UKXN22263196.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59e8348b54f5e57d095304bbdaa68e1b976e523cf7b10adcfe97adb04b84befe. 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/UKXN22263197.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1dd9d848eb553dc5ac3d62f7ec118595d437cca522872d836a1535c1d4f1695d. 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/UKXN22263198.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6e5c66260d0ca7fe908caa028ede73022a889f696bb8e965efab2a995b12939. 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/UKXN22263199.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff0ba588b92945e2012095e2ec0930f00264e9cd3095358543c31fb0559729aa. 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/COA721700002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24b537f11ccdf9d9b53dde06702cb0d681e1cb9eda1fbfc90e63b2e2897fd1f8. 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/COA721700004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x105f2927b55e76a5f2fadc29af1e557343af53a787195cb588e1efbe9d1b65de. 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/COA721700005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87c1e442ea51ecf415e5b59d4fc8155871999bf9db19c72938e1fdddf22e7c2e. 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/GX3Q92499180.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23ac9f4481021b975d0833cba1b12ad3ad6d95b9e8bd671b0531fe53600f03fc. 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/GX3Q92499182.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2679b9353207b45e46da879fe21baf926200612c9084f0683ee6f715e33fb306. 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/GX3Q92499183.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2f4f4e159a50923d263223a660a3ae36b4fdcf92485abeb198b59f2af8c5993. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), 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/GX3Q92499185.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb00e02b4ff01f1977e1160806c83230965501e9afe110445ceaa62a558ff1eee. 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/GX3Q92499186.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a2b524c2a1693143809389a1314518e632ed531d5d80b53638cff5b903ee17f. 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/GX3Q92499188.