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 0x15ff4c7c25e92a681cef854c5f2fd34d21b7fce043f78ebaaf9e3de14f994d55. 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/5756c865-8715-4d42-a97f-db8538e86066.json and https://artists.proofprofile.net/proofs/artist/5756c865-8715-4d42-a97f-db8538e86066.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 0xab2013e9603cff04e92a5d241a93a6bcba03701f2e2840bb62f25b38bb5a9045. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/QZ5FN2139110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e1168d03aa3bf56ab5d77479e6a21cac13580738cfcf204ef5b969fe973e175. 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/ITLUK2100001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa430a844726010836b4994224307a0630b624800c836371efe20959b8e0e3ad1. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/ITLUK2100002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b566af371ee877d3598a2c6d6ac6263f3019643a05c573fff888b54d3253681. Chain 2 (Bitcoin): anchored in block 960177 (2026-07-30T00:21:01Z), 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/ITLUK2100003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xedaa4c8712f71a143382b39a9c16a4350335aeb00328fcbf5753b9dc54d7f1b8. Chain 2 (Bitcoin): anchored in block 960164 (2026-07-29T23:23:05Z), 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/ITLUK2100004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4600640aa155ecb82c49f861c8baba43dd09685dd6ba18486436a42e61433ba. 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/ITLUK2100005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa76430a99b73e302f6c4d8286e65047e10dad6614556129dccda9c95e6d475cb. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/ITLUK2100006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc064b2fb97479a92ca5d549e26ff717f75461e02bc7d5ea3c67495b5a8d19502. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/ITLUK2100007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd401e694a3661873c3cd3c03ae9eb4ea5e6de46727e5bb02b874dcb597862638. Chain 2 (Bitcoin): anchored in block 958538 (2026-07-18T10:30:13Z), 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/GBWMY2151460.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5a6f461624f8ac86d8597ec01b49e0594e9ff8a0c77d36fe4975a94bc98be94. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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/US3DF2483147.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b8b05770dc26b72a7e8d0c6a529d889172e4a97dcb978f3023ab88236af6c82. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/US3DF2483148.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0bf9b35ef5891082f8dfc39732f5c59b40c1ed480e6a30789ecd8fc2a931eba. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/US3DF2483150.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ff929fde79cbb2adef842f8c38983e735842ea25b9ec4697cb612c6a5e6640b. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/QT2VB2434998.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x911db3d340a33d07f05e0bb5cb830a6f32bce8481a4728b7bce3d47593c477c7. Chain 2 (Bitcoin): anchored in block 958689 (2026-07-19T07:11:11Z), 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/QT2VB2429144.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ef1b94356b0f53ee015a7ff38263f05330d1fb33b2565c581d3611b425328c6. Chain 2 (Bitcoin): anchored in block 958650 (2026-07-19T03:36:41Z), 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/QT2VB2428694.