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 0xb22509577c55f0824fa53a666f93285360361f6f04df5f22957795c2cc13db4b. 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/9d238204-4180-4327-ba2f-d3a5839b7d59.json and https://artists.proofprofile.net/proofs/artist/9d238204-4180-4327-ba2f-d3a5839b7d59.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 0xf3845ac110965250333e58d83cca319ac09e6705492a28579a88d91ac4fabfa8. Chain 2 (Bitcoin): anchored in block 958060 (2026-07-14T20:39:42Z), 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/QZFZ32322113.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29f324affa36a769b97c8277c5c8d66b46235cec995896d40612a27c1a83b9b4. Chain 2 (Bitcoin): anchored in block 957965 (2026-07-14T07:07:52Z), 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/QZHN92339097.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56669335b75cbd8cf60b097e376c7dde5e5f017a328219fdf7b97146de6432a6. Chain 2 (Bitcoin): anchored in block 958208 (2026-07-15T22:40:25Z), 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/QZNJW2373547.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe828fed1ed67e89c421181f439d608145ca6eb5e5fe665f0ae4f6fd3f4f1d774. Chain 2 (Bitcoin): anchored in block 958060 (2026-07-14T20:39:42Z), 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/QZTB72317816.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc450a895c0c566584089957faadfe44bbb69ee1488839a4826f89149ee1626b3. Chain 2 (Bitcoin): anchored in block 958153 (2026-07-15T12:03:04Z), 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/QZTB72361211.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9e4972cc6675e7668f0150e772482f8d08dc1217d462218074382f6e9c16aef. Chain 2 (Bitcoin): anchored in block 958208 (2026-07-15T22:40:25Z), 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/QZ5FN2471680.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42d4cbe472a6baf96f54d0af949261ad8ceb422e8bb5739f00fc3ef4f7855f8c. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QZ5FN2471957.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa392e294818a2ad7702db00aaa1c6c8407f85ed2474bc0471641377ecf0268e. 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/QZ5FN2472733.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c770af4fa027ec277c4939988c6f1c4cd90db9341d5a1003c8f6e9332404a8e. Chain 2 (Bitcoin): anchored in block 958208 (2026-07-15T22:40:25Z), 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/USLZJ2405361.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd57c86fc4e32c7019cdaacac791c5cef2d5119a83e670adce4296b9fdca2722e. Chain 2 (Bitcoin): anchored in block 958063 (2026-07-14T21:07:34Z), 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/QZHN72402597.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c68251371cac46caf371f8c52a915ef548eb778dc50039e27169e35ad210399. Chain 2 (Bitcoin): anchored in block 958211 (2026-07-15T23:24:33Z), 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/QZHNB2435980.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8d25026126ffed6353f5729cb3df181c48a5c3c30b9dcf8c0ae1e25d8a05206. Chain 2 (Bitcoin): anchored in block 958152 (2026-07-15T12:00:27Z), 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/QZHNB2433214.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e44c0500ade3d12413b55eb5941888b63ae0277e555a65b95bd5afc4bf73f89. Chain 2 (Bitcoin): anchored in block 958060 (2026-07-14T20:39:42Z), 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/GXD7G2445958.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c317800cf0241bb838fac21f457ace747ed3efcae57d50a2d0badd93e2a4294. Chain 2 (Bitcoin): anchored in block 958203 (2026-07-15T21:24:46Z), 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/QZZ8B2432178.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16b7002ba0e13ea78aff05e2be58d90425a216cfeba5f1dfcee1d980019d1594. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/GXBAV2520890.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04df6659a943d40e6cee7da1f183e43c10a20d5e76a0eb077b52e6698de87b32. 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/SGW502583181.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb11fcb677c8f1bf455547f1eb45a180d5fd7646039492d68ce02d8dbb3fe69e. Chain 2 (Bitcoin): anchored in block 957782 (2026-07-13T00:52:48Z), 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/QZTBA2509983.