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 0x2df008baa7ee349996c7439ea72cacc0d7035e977066dc404690795a81733e86. Chain 2 (Bitcoin): anchored in block 953778 (2026-06-15T11:57:35Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/acb8d8e0-a037-433a-80be-5fcd563746e2.json and https://artists.proofprofile.net/proofs/artist/acb8d8e0-a037-433a-80be-5fcd563746e2.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 0x6f80ac9bd040129e209235ccda2a4e192452b0cf5b1d0b6372cdb978717cc80a. Chain 2 (Bitcoin): anchored in block 958746 (2026-07-19T15:36:35Z), 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/QMFMF2411212.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x209b0f35407be6adb3051332d1eb7439316fc40456ad2d5959ccce8b66c115c0. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/QMFMF2411236.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5ef9a38113e6ea49225bcfae354ecdecda2a0f4b812ca4c6e5f28a4636998dc. Chain 2 (Bitcoin): anchored in block 958436 (2026-07-17T16:42:22Z), 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/QMFMF2411310.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9dd01986fba2a0e0bc17a1ed4b6abafa650d01a1d29486b8225f496c0d7f086. 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/QMFMF2411322.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc475371eb7ac3227839a28110fe7cff4cb81266614722610921a6e817dff456e. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QMFMF2411335.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b8e7a00af0afc88167ba4d09450ab0e59784d2c82f98ddf206d7176394e5a95. 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/QMFMF2411339.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd90412a759b38ea1ad4c2594ed5e3b6d070d93d3fd94f9938e1b19b5740c0ed6. 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/QMFMF2411342.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b11ef5d0605394d4175e7776be8e22e54275d3140c12c6646a101b1f3bd1c27. 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/QMFMF2411359.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbba52b6f16e514bef0cd57ee348e8af1eaa4c096da4ee0caacb7f78395455ad2. Chain 2 (Bitcoin): anchored in block 958908 (2026-07-20T18:08:58Z), 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/QMFMF2411367.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcad6b8d81fc94b47b99907f08198671b5f21d21c2b16d55938a3f86953021b07. 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/QMFMF2411372.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09788a7fd1f2ca83a2d9a5d62d834ec75b92a4151d8dda143d5a455f7a941f54. Chain 2 (Bitcoin): anchored in block 958771 (2026-07-19T19:27:18Z), 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/QMFMF2411377.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54b3a4748b3d2a46285fe6792453c8dcd0acf41ab6ca6c3cdf0bcebd8f5aa260. 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/QMFMF2411378.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6484695aa33465fda2c980628103a5b1001ed9969b4ce9fe0958d1a081beb19. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/QMFMF2411408.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30f8840295296b3d0db4842dfab0c95ff57406820c7322c67de5ec84f7d6d058. 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/QM6N22000262.