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 0x0f59c6690c8297cc5490a2fc4f0a7089d701b5aa4d8903c79d6b0a6a563c66ee. Chain 2 (Bitcoin): anchored in block 953617 (2026-06-14T09:00:45Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/1cbccdfc-6dbd-44ee-bcf4-a99fbed60061.json and https://artists.proofprofile.net/proofs/artist/1cbccdfc-6dbd-44ee-bcf4-a99fbed60061.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 0x8c3b420220bffd2017adeff9392d2d563a29fc6af933d847fba810c9c6e9b8db. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/GX53U2498715.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0123c62cdf8e31188f2f1f693ea52ef56cdd9c05228517a32c27b90fdf8817a8. Chain 2 (Bitcoin): anchored in block 956482 (2026-07-03T10:33:57Z), 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/GX53U2498687.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10d384910d47b440911d4fb5d74aba401a7d040d2faed1088994f9100a19bbbb. 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/GX53U2498679.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76dc1944a29f70f51105385bdd313b1345a3aa999178615cbd4316292995d520. Chain 2 (Bitcoin): anchored in block 958170 (2026-07-15T16:21:50Z), 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/GX53U2498680.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7843a47868d9c8fa2d020b66dd26b5bb5f08a023f720098d19def95217688b17. 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/GX53U2498681.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc25608bb5cca5ee967e532045dab6915298010a283cd3c3d30d0ad76af1b6e7. 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/GX53U2498682.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a2cadb548d6241e8cf7097c5aeb941d3b5c6eb86caf60a1f82f0d9d428f2950. Chain 2 (Bitcoin): anchored in block 958169 (2026-07-15T16:16:18Z), 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/GX53U2498683.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbdb687d1aacd68a6dc8b51e594903b4a784aec4f6bd11f696c6861d580ed51fb. Chain 2 (Bitcoin): anchored in block 958228 (2026-07-16T02:46:47Z), 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/GX53U2498684.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63de690e55a22194bce64bde8d3c59f6f87ff38130e06727395d9ef2ede409c8. 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/GX53U2498686.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d4170f2082636c8e11f91c3dd6980567824af0e3c7d9dbc61a6a24d3fe61587. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T10:20:17Z), 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/GX53U2498716.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbebdb198b526b61b34f3292df54d2c74aa4e122f1734b7358829c83ee1a85152. 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/GX53U2498685.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ed9514dfb742b108adccba7605f15d9dc5ec45b7aa7ce61d06a9b64a94512f6. Chain 2 (Bitcoin): anchored in block 958202 (2026-07-15T21:23:21Z), 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/GXF9Q2427872.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88929a294b2b4cfe7d979d9bea1d03a3eb135bb1e1fb3383b4112536678a23c7. 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/GXF9Q2427873.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b90adbc6813a39e7205e2b8025d4f08476d93118820ca603d3d7fec43f678d5. Chain 2 (Bitcoin): anchored in block 958208 (2026-07-15T22:40:25Z), 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/GXF9Q2427874.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c533a06e57c9b7eb6a0d2bb97cbaa9c44c0ca831900144c674f2d95a8467d75. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T10:20:17Z), 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/GXF9Q2427875.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2b2526b83e0203e635be36168498b600d1eecb0aacf0282c25e6cfffe1de3e5. 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/GXF9Q2427876.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb4b52f8d649a856c75941dbf580dc1c64de987fd78f2c6635aff52f58294800. Chain 2 (Bitcoin): anchored in block 958176 (2026-07-15T17:14:36Z), 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/GXF9Q2427877.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa37bc194b4197013ed1dbff0035f31d0bce93e519462f5e513dda7fb9692321b. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T10:20:17Z), 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/GXF9Q2427878.