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 0xfd7c02606a772308d9195660c9467c20db3eddafb91305df080fa995412c682d. 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/3496243a-955c-42b6-9fe8-a11400b98381.json and https://artists.proofprofile.net/proofs/artist/3496243a-955c-42b6-9fe8-a11400b98381.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 0x93d80b22375f6889ab56076fa7d38fe99aebf391eec014fb7f0a3f13cc279cc3. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/UKXN22331389.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x266b5b4fd8fffd2360c5f33b398c13a64b76e3125846613452b88969088c7640. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/UKXN22331390.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed0f38af49804b6e91c101d5274c44c321a665a5b2ef8f401c5d7e3336a51422. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/UKXN22331391.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a440e274569a537a6d9e8166fedea1f682e5c68583246a4f900fbb92a0959fe. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/UKXN22331392.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae9ee164cc00dc41ee17f4aa22d4576a7084468770368a6dc47fb37ea02e5726. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T10:20:17Z), 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/UKXN22331393.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x401bcb347bce4d4fefcfcd9ffd5c2dce62bf11a861a8687843950826fff87a94. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/UKXN22331394.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47d10039d79099eecdb5be9a2a5055ca84c4c89dfb1f694a21df940cd9e4a7af. 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/UKXN22331395.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7828c98e817876e9bf420b2f1237e03d701fbc15deee4bccc62d685cb6edac8. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/UKXN22331396.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51675d5a3459560a68bae53415f03e059b9f0df385f515175a36ab174f392385. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T10:20:17Z), 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/UKXN22331397.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd644863a0f0a0a70551c498f22690d2c0c64b494855eeecd5409e5d72ec3c4e4. Chain 2 (Bitcoin): anchored in block 958357 (2026-07-17T03:33:42Z), 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/UKXN22331398.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa48860c351ddf4b39131304497af5d7c779fcc7966d15a93cf0fa1602b2a7b42. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/UKXN22331399.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61a190453c364155d1f98fb1ebc0736c34ab9f4e581fa679c0af17d1365dee0b. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/UKXN22331400.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc92f6f0dfe62601b23a9db1a4370f78b03609a1c47d0f570fd390a643bd58e2f. 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/UKXN22331401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa522c0914da4b9f1207391ecb4d5e1c4a5671ce7181937480ff50f5875419a0f. Chain 2 (Bitcoin): anchored in block 958228 (2026-07-16T02:46:47Z), 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/UKXN22331402.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23425d997b81ae4b80560a9c656642a892859d3a94f3470fec8415eb46907c81. Chain 2 (Bitcoin): anchored in block 958415 (2026-07-17T12:50:13Z), 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/UKXN22331403.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1aa99df741a1d5ba8479c7a238e2f041ef0e9be1443637d3797e3377aff72fa2. 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/GX3Q92414303.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c3f03f49e36a0849ec027c66fbe070e1dd1acc29006f30a8a6710c96ac6eef9. Chain 2 (Bitcoin): anchored in block 958176 (2026-07-15T17:14:36Z), 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/GX3Q92414304.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf03bb40a61d76068339832563871f3015933a555bf2b70cb4027f44dd03dc820. Chain 2 (Bitcoin): anchored in block 958176 (2026-07-15T17:14:36Z), 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/GX3Q92414305.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd9649625e200b72661751d5b3c5833e758382ff26c6e4ca4c07d15810d4cd36. Chain 2 (Bitcoin): anchored in block 958234 (2026-07-16T03:46:09Z), 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/GX3Q92414306.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f7db6bc52af558c6e34bdeeb4c5fb1adef6ab0e08291a7b53189c88718bb307. 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/GX3Q92414308.