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 0x8d6721e78ac57c50c9a1d70e794d9a8e4686cdf3ffdfa07d8cec8c6e047128f5. 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/1d637cff-fb05-4282-9cfc-3fc1bf454b7a.json and https://artists.proofprofile.net/proofs/artist/1d637cff-fb05-4282-9cfc-3fc1bf454b7a.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 0x2d8a1409e51d49e376137588e3d2989276325c6e03051a0cb108589feb81f4b4. Chain 2 (Bitcoin): anchored in block 958846 (2026-07-20T08:14:15Z), 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/QZWFF2308641.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb08d8c59a362abd119c80cbcff3ad89e746e31da52ae83c7a5c2dbd765b5351d. 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/QZHN42440575.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb08d8c59a362abd119c80cbcff3ad89e746e31da52ae83c7a5c2dbd765b5351d. 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/QZHN42440575.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2900155721d6ee38b9ab83ca8e64e70cfa2b5160d038297d48b74fa1451c23ef. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/QZK6P2462706.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6fe624ed990730b63fddac7cd5bbeded050e255b37adeb8a82dbc631d6b1baae. Chain 2 (Bitcoin): anchored in block 957546 (2026-07-11T09:35:53Z), 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/QZK6P2462717.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6fe624ed990730b63fddac7cd5bbeded050e255b37adeb8a82dbc631d6b1baae. Chain 2 (Bitcoin): anchored in block 958601 (2026-07-18T19:27:02Z), 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/QZK6P2462717.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c2b38da1ef06a43d8fdf7e7e5e1ed015dae68bcb86746768a7e45a9c5f344d8. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/QZWFJ2475501.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c2b38da1ef06a43d8fdf7e7e5e1ed015dae68bcb86746768a7e45a9c5f344d8. Chain 2 (Bitcoin): anchored in block 958436 (2026-07-17T16:42:22Z), 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/QZWFJ2475501.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9affaf6d58c7b042f5d1b7c781e655bf41ec8c3c777ee0f653f484daaa971c88. Chain 2 (Bitcoin): anchored in block 958538 (2026-07-18T10:30:13Z), 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/QZTAZ2495059.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd44188438a000f3fac82437276fa7ce10d450e7d4de493c710e1567a24adf04. 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/QZTAZ2495055.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9affaf6d58c7b042f5d1b7c781e655bf41ec8c3c777ee0f653f484daaa971c88. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/QZTAZ2495059.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28d47a45d76092b3e911680321401ff0e9839a29e8d7ca365575e1f8a7ba7daf. Chain 2 (Bitcoin): anchored in block 959061 (2026-07-21T21:34:21Z), 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/QZTAZ2495062.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca93ab6d3de985702778e81b8523036b6ead0cf952f6673fc1ccb03b2786ad1e. 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/QZZ7X2493441.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe7810727fcdca884b9b54dad7bb44d5e0e76c5b7cbe8f2cb13ed5441da63975. Chain 2 (Bitcoin): anchored in block 958955 (2026-07-21T03:03:40Z), 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/QZZ7X2493432.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92c2d377141d0b4910af5901e720d889d30ecee139fa844c395b23e5d59aab30. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/QZZ7X2493433.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9019e4e9e27bf248728139c4d6552543e2c5fecba46376eb3957db5642a99b98. Chain 2 (Bitcoin): anchored in block 958465 (2026-07-18T00:04:42Z), 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/QZZ7X2493435.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d189164d284d117ee01ab03f6232b7c4ce872cb972547e2c128917826d6dc98. Chain 2 (Bitcoin): anchored in block 958907 (2026-07-20T16:17:58Z), 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/QZZ7X2493436.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9516194f2bcd5bcb20cb2d3031770511d8a13033c0ebb07f6479b529122b64c9. Chain 2 (Bitcoin): anchored in block 958552 (2026-07-18T13:15:29Z), 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/QZZ7X2493437.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ea6a3483bf7aeba31c3ec38cfdb5dabed70d6f2a50da1aaed1e0ed5dffd56a0. 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/QZZ7X2493439.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca93ab6d3de985702778e81b8523036b6ead0cf952f6673fc1ccb03b2786ad1e. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZZ7X2493441.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdfe8c201b14492e84addd42461e73a25a94ab5c96e27eded4ac98d38a71836cc. Chain 2 (Bitcoin): anchored in block 958907 (2026-07-20T16:17:58Z), 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/QZZ7X2493442.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38bc7a277dde1b66133be4af8d66c4df486e5477262cc3e8afd303635b7601bc. 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/QZZ7X2493445.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac9160ea417adeb20afa802a207e56af4c6ddd0b2df963d7226fae2c32549b0a. Chain 2 (Bitcoin): anchored in block 958526 (2026-07-18T09:09:53Z), 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/QT4K52574535.