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 0xf532f6ea59cf11d42b72f523882291cee7b600f53290ac503acbe0d56c183171. 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/d25997bc-2174-4f70-a7db-c6be469ef2de.json and https://artists.proofprofile.net/proofs/artist/d25997bc-2174-4f70-a7db-c6be469ef2de.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 0xb9e10088f798aec0daa5ab6e72323b7b21d40aaa1e2feb8f72634aeedefea36e. Chain 2 (Bitcoin): anchored in block 957851 (2026-07-13T11:26:33Z), 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/US6R21306819.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb84336c49cd391881506f6aee3eb39a7d99ecea9af9887ef79052f44edb57b7. Chain 2 (Bitcoin): anchored in block 956402 (2026-07-02T22:05:07Z), 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/US6R21306820.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa76373ae4b5e5eab0e82a0aff5039877d6b44a03fa4befa4a9df746b404b8e18. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/USY252418216.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb4a39d10ed16c0a1d370e0c1edea07e6fb732b1dd81f649380c39d8a8a34e21. 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/USY252418217.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3623fb9b97d5164208380ce7f46a2d8b3f326e7c063f6a4579e595b9155411ef. Chain 2 (Bitcoin): anchored in block 959058 (2026-07-21T21:09:36Z), 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/USY252418218.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9566a63d6f2bf3739662df84d5ef291e9f6ec014985c10709d2b73e650d04487. Chain 2 (Bitcoin): anchored in block 956859 (2026-07-06T01:42:12Z), 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/USY252418219.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff22f58832eeb905791250911469473e73b9fd33a783902edef917c48eedc285. Chain 2 (Bitcoin): anchored in block 958857 (2026-07-20T09:45:25Z), 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/USY252418220.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5739a95ee895c238984a97240597436f544a8011085934fee1ae4e47dce795d1. Chain 2 (Bitcoin): anchored in block 958341 (2026-07-17T01:08:10Z), 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/USY252418227.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d844bcd83ac33c0444fee71c4518a6f9b2d0a97b236f5ac1fb081e214912bb0. 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/USY252418228.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a407f4349105d4de4673faa7479bff6c9e3111ebb897cc6b35801a42d2ed86e. Chain 2 (Bitcoin): anchored in block 958404 (2026-07-17T11:34:58Z), 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/USY252418229.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03f5de57ff10a48275666cd337a74d98845a3273aba3afed22666112b5f45b51. Chain 2 (Bitcoin): anchored in block 958602 (2026-07-18T19:28:16Z), 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/USY252418230.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8eee13ca178acd224df241730cc0ab0066df2eeab5a8e5a130c945b9c9d17a23. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/USY252418232.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x100b9c367818ec645782be1d2c7acc84604cd047b411b1e750a6b939bc7a99d8. 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/USY252418234.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x582d9f966390f3a544c9ea3ecf02d58ab03f21088d3d891d7447fca5f27589a1. Chain 2 (Bitcoin): anchored in block 958901 (2026-07-20T15:07:00Z), 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/USY252418235.
Punk's not Dead: A Tribute to the Exploited
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe25b13562b935debeb88c9d4d288acba1b239d94874b3a3b0d47f54d64485eba. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/USA560588588.