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 0xaf82e335d1401a7dce9df80f4237769ef59c1b0d820086c59b5ddef867f555d5. 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/fd12c20e-2732-442b-a5f7-8018a4d2dcc7.json and https://artists.proofprofile.net/proofs/artist/fd12c20e-2732-442b-a5f7-8018a4d2dcc7.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 0x523fc102f878a286b332ef2b4aeab6c4878edc536d43040ef2c421fdf1f94f4a. 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/TCAEA1821698.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a4be46c64e3b0f2cab275c34bb3525993151b20e64424f0945d558d176c340c. Chain 2 (Bitcoin): anchored in block 958489 (2026-07-18T04:13:26Z), 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/QZFYW1961879.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f45e8065b7962f31338d4b2f8f1dbb7666c1040f00994a6f42ad5694fa35d93. Chain 2 (Bitcoin): anchored in block 957805 (2026-07-13T04:34:37Z), 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/QZFYW1961880.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd4cf98f3e3faedd771bc3ac3c3cfd1c57a86a2c2de071405a59f646a624a843. 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/QZFYW1961881.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ec2a41cbda5fe4d44a631f990deb48065110abafa29bbe380d2c913cace2865. Chain 2 (Bitcoin): anchored in block 958501 (2026-07-18T05:33:04Z), 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/QZFYW1961889.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9eb12a50447977d536c4d807b0312a1d3ac7bea720dfab7bf94013217234a7d. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZFYW2035451.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xffa8583da933d88260324a1ae9cc48304e57727c6b7ceb89cceaa9da7be8b4ce. Chain 2 (Bitcoin): anchored in block 956711 (2026-07-04T22:48:52Z), 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/QZFZ52184901.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11f67f83ead43f976dbfd87c9b3710596a157d0d2b36347337753e841735e6f6. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/QZFZ52184902.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93da95c8927ffb7da672f46ce9386e67861220bb8c2cbf51caa13cafb0f08e61. 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/QZFZ52184903.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48010d8e4193ccfc428b0b022ae4716c9e6910267813e2d2d19fc29d3ae2bc88. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/QZFZ52184904.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0b7413e6d574288211fe3c602d6fa403d1233aaf9615196c96ac9f772e772a3. Chain 2 (Bitcoin): anchored in block 957874 (2026-07-13T15:43:57Z), 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/QZFZ52184905.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90f8e86649fe67b860398b76c511326023e9e2b7a33100cee3d8484155570df4. Chain 2 (Bitcoin): anchored in block 958622 (2026-07-18T22:58:55Z), 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/QZFZ52184915.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9190a9573f2b8ebff982e1d28e0b10e70261b8726a40c928c8bd89db6d443eaf. 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/QZFZ52184918.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9110378a25d2c55e278dd92f035e6a75c639f1317dd1b5615910057f5b6d477a. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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/QZFZ52184919.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x577f344fac7bfa10452f4a0df85ece3fccd02186764f254948ad5cbffb0aa785. Chain 2 (Bitcoin): anchored in block 958218 (2026-07-16T00:33:33Z), 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/QZES82167561.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x998e981d2628d1cac48678e5fb949f0b2d137ac491a9d316b71082af136a671e. Chain 2 (Bitcoin): anchored in block 958501 (2026-07-18T05:33:04Z), 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/QZNWY2302786.