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 0x945724411273ac9010f35abadd370e69e3c8bd3ac8386e851c79aeb63e968019. Chain 2 (Bitcoin): anchored in block 953791 (2026-06-15T13:40:30Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/dd951d7a-b4bf-48a9-a1b5-52bff043199d.json and https://artists.proofprofile.net/proofs/artist/dd951d7a-b4bf-48a9-a1b5-52bff043199d.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 0x9c1520efca199717bdb823210688e5e023badddcf9ec1b20c5c166807f1ff03c. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/QZS652477554.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25b8a9823b548e5f9adbe062087678c3a790a948f866816c04f31ce42a6ebbf7. 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/QM42K2462064.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9ab10585d800d76e67cb33b7d1eea7352c69d440c230577cc885c3d43e0ae58. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/GX38U2314943.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0b98c016b9ec74b4c757251f357d3d4d9fbe2a9e6fedb98052196cff8d7d58f. 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/GX8LD2379861.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x017f7c6ec479a9c332035655a624d8e1d89f9c7ffd7f40b79aad3c5cd1457e6d. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/QM42K2388485.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d00c6fb0b7f6e2972c2a118fd1d7bc876274611e09cabcda0535e40fae032fa. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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/QZS642310112.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09888abf427ed8f91f3753b6591b2a8a0e74213788b6d4a83e5e7b8b6de53b0a. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/QM42K2304671.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3fae0c94971470f71f2559980633d49c7e09e59025bcadb995fc4e431f8efb76. 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/QZMHM2315922.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa26087daeafe0a5429620b2338241215db987113a57ca736364bf9e77c7f1f5f. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/QZS642381714.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x709b5c0427a3398f1675dd50e6738683a4269b98ec51c250ee0ad7f20ac1a1e2. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/QZMHL2390327.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50436243cc4d9f55ca56d31dcb4fa1dcc5c997e96d85d02fda317586d463f6dd. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/QZMHL2355489.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa731c65c02ea2c8fc68f13f7745cc1c88e170400847df8a412bdaa09e0f0c4b. 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/QZMHL2370529.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b98df9e0e5ffe5eb6f8e9c1dc5035ea680003e459415b8cd1cbffc1a8b814da. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/QZS652395520.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19cc76241b1cbe52ee8e4352b32bc1ce236ac0410ad52c8838103ec1d990113d. 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/QZMHK2357863.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3de0675340e4b565d45d8a5b6dc96d929701b1a3bf2c7145a7669465d7d30452. 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/QZS652399599.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x613a287d5b3b09932442e9bbb1052944cc265248fdf52f1c0a02587a6c74c9e5. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/QZTAT2376649.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f3617d4eba08df9e4a552b29856f734f2e4716201bbbae81f54a81282286940. 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/QZTAT2376650.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4685e247adfae369b5c9bb6ec83c909b732d3597075389ad5109be26734dcedd. 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/QZTAT2376651.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6affbc9cb62ac089a44feec4118031251fb00264a01bebe64efc8203d17fc2a3. 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/QZTAT2376653.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x254f078dc418b9e9f42167d42326dae4176ce7b2ecb6b270131044a18e80902d. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/QZTAT2376654.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcefa14b2199466571ceca65bbf26d6d479e6e5c914aa0fa585856637f9fdfca8. 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/QZTAT2376655.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54cb1b55c60cac7c25175c7ac6cc74d1312ffffe1bc60baa8cfa5941ba6b041d. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/QZTAT2376656.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4410a7b244cb4d25dbe918c763fdc9175735e3e49d945630f72505a1b6421fc8. 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/QZTAT2376657.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf835c35930c6e40ccdb4bc8697cfe95cf2be99a379fbcf0616ff1abcb8dc1659. 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/QZTAT2376658.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2964242cf0aef0176b074dccf23206eb80d9acdbe29810e89bb0b14fef3a536b. Chain 2 (Bitcoin): anchored in block 960506 (2026-08-01T03:50:58Z), 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/QZTAT2376664.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb852f21079adac1fc6fa44cac04d0a921d5598179f0961cc8299a848aa0341b6. 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/QZK6K2356823.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c1520efca199717bdb823210688e5e023badddcf9ec1b20c5c166807f1ff03c. 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/QZS652477554.