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 0x452ff814e07268fa0095fb35264f12240f72033f66020073a8cad9260cfc99b8. Chain 2 (Bitcoin): anchored in block 953746 (2026-06-15T05:25:34Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a326e149-f9ee-4873-80ec-69b1ea7ae473.json and https://artists.proofprofile.net/proofs/artist/a326e149-f9ee-4873-80ec-69b1ea7ae473.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 0x7f5672d4e3155a62ce46568807731a1e475f1b4acc4958aaeafdce164750c2c6. Chain 2 (Bitcoin): anchored in block 958977 (2026-07-21T06:27:23Z), 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/QMFME1900883.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d7eca52e304fc3a5321343f62abe90f92e1f993abc7923e4610d47eedebb3e7. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/QMFME1900884.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc0edd3747dcf91f6c3d1dafb207b69521ef3694c51fc274b8c327a5d1dc98d0. Chain 2 (Bitcoin): anchored in block 959132 (2026-07-22T13:20:46Z), 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/QMFME1900885.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a7df6600c3c6afd48e4abff6e810e81a07a743f1c8ee065325f18edf426450f. 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/QMFME1900886.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ef1d31d7d4beee2f97adf6b5a6ff86aacfb242fc4e70fc66f6ef9bfae32a03c. 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/QMFME1900887.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1c014d5cd946046679cb1948ccdbbb535184bda92195debe55091e9ce20f515. Chain 2 (Bitcoin): anchored in block 958770 (2026-07-19T19:26:13Z), 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/QMFME1900888.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb71b5740a4d26a3f8c46e719ab419c1b7178d6830b97cfef95a72f4cedd8b769. Chain 2 (Bitcoin): anchored in block 958842 (2026-07-20T07:48:27Z), 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/QMFME1900889.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71a8632e20d37e45bad2aa38ecff24eebbea2e89be7963383168ec1fcc05174a. Chain 2 (Bitcoin): anchored in block 959094 (2026-07-22T03:33:16Z), 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/QMFME1900890.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9acf01032339eeec4ef41ab76917bfd45d70804f488e907ecf7522faf010d9d4. Chain 2 (Bitcoin): anchored in block 958523 (2026-07-18T08:54:12Z), 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/QMFME1900891.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee28bc9cd72bf6baf70895da99839c186b6f0262e2cf906554e1b403d193689a. 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/QMFME1900892.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x771fb1e5c9b093ce237d55e7e4ceb2f22b74613604bac0890d2185bd2c778daa. Chain 2 (Bitcoin): anchored in block 958091 (2026-07-15T03:17:03Z), 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/QMFME1900872.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c0fdf7c1ede0cb08e77515e9fbf0e596241c82683e0aec854867744577a42f7. 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/QMFME1900874.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09ab5486566fa65fb81b63af2eeccfd0dab383d9565148d531b9398f859bc8e0. Chain 2 (Bitcoin): anchored in block 957770 (2026-07-12T23:17:00Z), 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/QMFME1900876.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6bcdab1bc847040f2ff7a8946d40225c645a5ed6f40f97052c7c655453e7b11. Chain 2 (Bitcoin): anchored in block 958517 (2026-07-18T07:54:29Z), 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/QMFME1900877.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40c7f41057ec48cd0cdf575685a0f29946eff92971bb62f917273e6b0837f621. Chain 2 (Bitcoin): anchored in block 958180 (2026-07-15T17:59:52Z), 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/QMFME1900878.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb899fc710e1d1d55bec39532a897fb8af6cd318ffa50a086ac71f40706aeccc3. Chain 2 (Bitcoin): anchored in block 958238 (2026-07-16T04:30:31Z), 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/QMFME1900879.