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 0x6389bbb6a4deac9edc3020845224816b0452432bb55616f6645f787c94a035e5. Chain 2 (Bitcoin): anchored in block 954065 (2026-06-17T08:10:43Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/78d66827-6d74-4810-920a-432e1ed4f1a4.json and https://artists.proofprofile.net/proofs/artist/78d66827-6d74-4810-920a-432e1ed4f1a4.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 0x59b2796c77a7a419db3a1a25c0a3db857ba44412f5e61ddbdbbe8cc5b8fcee33. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/QZDA61967474.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85249ab407b7dd2fa87a069655dbd411dec2e581b651fd2d0bcf64f2648abe70. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/QZES72330396.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9189335d15f93504fe587ee8ebbc603004eae9cb55518fb93bad6c985e05e2c9. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/QZES72330397.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56cbeb567ac913596dae94d1c835616764903288752b43f21c808cfd8d866440. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/QZES72330398.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4417d0fcfa0e33ab02eeb2bd5f1221e8b64ede331efe1c4d83b294ded3cba84. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/QZES72330399.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05990c136e9ebc976b4ed0148970dd25427e20f50ce0cf063e08fc83008d7836. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/QZES72330401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa63028a6a8d1f9c0bf9f5ad0d40b59c18c29d3fde25337b78b5c351d7e6f7336. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/QZES72330402.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9cc558796a4770bc021c66766312b060697d0724bb8416bb7615699015595078. Chain 2 (Bitcoin): anchored in block 960509 (2026-08-01T04:30:37Z), 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/QZFZ42061257.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x390961cdf8bde3b9dc34cd17526cc3fb51d3f23ef90837d4ecb24d7f7cbfc2f3. Chain 2 (Bitcoin): anchored in block 960459 (2026-07-31T20:22:46Z), 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/QZFZ42061258.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e88e91bf2fad08a9f7176ba15fb7fe510e5b73de440f27140940843c7b0cd6e. 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/QZFZ42061259.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77cebfac1756b6d3e4d2fbb3644021e16598dac1cc2c1f5d39bf7d974e683c00. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/QZFZ42061262.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76485200239c3473d6c3fb95f156510357a369941acfb0b0a132eaf0307aaa0d. Chain 2 (Bitcoin): anchored in block 960429 (2026-07-31T16:07:24Z), 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/QZFZ42061263.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e7eee7c5a60d0e906097ee2374e4cd4c3f98fee48ed38d45e2d9c6afbb846af. Chain 2 (Bitcoin): anchored in block 960463 (2026-07-31T20:42:35Z), 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/QZFZ42061264.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a9cbadc14c348ed96296dcf9620dc3f7460432a55a13b00c3482e2ff5c0dd09. 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/QZFZ42061265.