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 0xedd8ece7bf9a3351b57087121dded0e12d1fc4915ff80a504e201b3d9e232a78. Chain 2 (Bitcoin): anchored in block 953742 (2026-06-15T04:47:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/8934fb4e-bb0c-45d6-ad18-ea759e716f76.json and https://artists.proofprofile.net/proofs/artist/8934fb4e-bb0c-45d6-ad18-ea759e716f76.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 0x99943c8c007f982cc610837a1d9cb3a6738e129565dd0de50f6312248bab9400. 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/QZK6L2300866.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81bd448ebf4b98d60a849ca426b060ba71ef655d90bf3ba0dba511889fdc1624. Chain 2 (Bitcoin): anchored in block 957244 (2026-07-09T01:44:02Z), 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/QZK6L2300870.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7c9471db66b671ac0679f0a2531c0834f04fb6aa108a5f6454d9285321ff119. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/QZK6L2300871.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ead1208bcf0f84414a74dc0cc3cf55926915532ca7fc8bde8c32bb8ab06725c. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/QZJG52339633.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2e6a1fe6725b071fe68ce7e44af928cd59af5d0820eced8fc2ade7a85968a99. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/QZWFH2327923.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9eae4bf376d9bbedfc0057a9c9b2aade3f07d9538a51b051cc36f58267a1310. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/QZNMU2378396.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2eb5273d85ed6f4fc408eb48bf814a9374de2bd2daf9cd36e76a559d924c2e6f. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZDA82359191.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46119f411542526f688eff9ab1247f814d3ae3e8afec09adda5f8d52d304c958. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZDA82359192.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27d94eefcdc01f2cc2c7287f25b2eb55e7361e346937042ceb62bc1eb65b8a52. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/QZDA82359195.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62e08fa62e8933df14679ada917be1450edbb421538e0ea7c904ac24baa2ee67. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/CA5KR2319839.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24100ce1a32d877e6ef73a11278fcf0204ba91961ef8b08d6b648867c22fa263. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/QZNMU2238412.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2754f9a5208eeb2f5743c20bd0aa45d65bf413fab278464e7c7aef71aa212064. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZNMU2227113.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa10d1922e8f23e2564123beda5e3cbc2668c4a316e4768fa0647b6d3fde1533d. 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/QZHN61978176.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ec9d60a946e869435dfca8adc9bac25d9814a408bfe9f0d24e9fe32ded43655. 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/CA5KR2250366.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82697b1c909b9d213f0bfaac1fab01275952ac669e6b906e87bb7bf8108a5d7a. Chain 2 (Bitcoin): anchored in block 960302 (2026-07-30T20:09:33Z), 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/QZHNC1968788.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f705c4aca61b5f75ab992ef99cb33a3b9cd7e25af9ef8a9e680cf574ec7bc70. 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/QZHN41961368.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79eb787f767363886f402bfe5a244b64270f89950431dc9c738be77b1ea3d934. 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/QZNMT2123563.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x263f6a9e62377ea88e7946997afc6b507c025b31884cef76a8226c30a41c0251. 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/QZNMT2122803.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa602a80ecece6d00619351b88a4fcdf052ce8d6b7bd76c2753aa9b01a99334ae. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/QZNN22190712.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4e6b94acdc1331be1d42f61d1b672e95c2d05d39374441fa356496853a68506. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/QZNMV2081647.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d6f72ef1fb680b7554bc48802517ab0ad3b9f973dd8e61eca9c7993694ba07f. Chain 2 (Bitcoin): anchored in block 960337 (2026-07-31T02:51:48Z), 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/QZFZ62017017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39b2632a67f936ba218c49a7117b9285c3a2a8ea603c398fbe4e8e45775b4048. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QZFZ62017015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51ea27a7977f93cd5082058c4448e34c0eef5e9ce0998cf1042137ef1eac208a. Chain 2 (Bitcoin): anchored in block 960193 (2026-07-30T02:05:19Z), 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/QZFZ62017016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x958cf8787e6359f6704de90f7a1643e2375e42b9bd51eeee668b1746842a1725. Chain 2 (Bitcoin): anchored in block 960503 (2026-08-01T03:41:24Z), 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/QZK6N2448813.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30557af20babb94e286ebe32c16aad4b56989ae97106c49bc5d1dbfceed2c62b. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/QZES52031952.