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 0xf6bf8906da3f09c54116b832d8ba940c274781f735b4cfe674350ab222370dae. 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/039aa95b-8d8e-4f34-a23c-37abeb53fb68.json and https://artists.proofprofile.net/proofs/artist/039aa95b-8d8e-4f34-a23c-37abeb53fb68.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 0x61804fb74d91232bb8269c0fd2897c407318e47e8c36dab6c87d7783096d6186. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/DGA0L2439314.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6282e83c0e7d0567e3adb44509d25d562f83b20e69d747b05e01a81337edd8a1. Chain 2 (Bitcoin): anchored in block 960209 (2026-07-30T05:15:54Z), 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/INA7Z2304411.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x499b4ee0cf9824d11d627e8abe0509e9c94b0b1b3ffab7b68da186f62f9e279b. 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/ING212493429.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0049b2cf22cc0e7e8d03e70a25adc9f71d18ba85d6aecb506e381285aa8950f. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/ING212493477.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe655a756daafa1a85e7732d441c38ed1da7f684a956324d9dda70f47a4ad256f. 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/QZZ432320788.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72f09e421d15f48243baa4697a3073f56cf5bfd0fefd1f26a017a9a6434031ce. 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/TCAIJ2437270.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3be0def10dafd94a2c59f721b29c086ec12db5f2428498b787e9ff965b37d7a8. 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/QZZ432315225.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6de3a41b744da68ee29c6ef59c8d7f7fd9eb860f7298a28876628ce2e41c8b66. 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/INV792401252.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb73d20089d41182ce9535a7ee3106787ae8b8e3d28a6ea22bbe9c6deb75e6f9. 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/FR59R2495905.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0028f148c24f0e93cb483df55ba69a4ae51f0d7c1328cedf5164f1cdc5ccbbac. 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/TCAHU2410796.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c442fc4df49580ccf6eff66e9590a90203c1a71f38a4c1204823e6b54bd8ebc. Chain 2 (Bitcoin): anchored in block 960427 (2026-07-31T15:59:18Z), 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/INV792400267.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7772cda807387b06a65f19aad8aa2b5a9ad0561778780edc2760900ea9715985. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/ING212349313.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1e792ddc0ffde5dd65430f3aa6ac5ac0e1ddcc036ea257194a3a67f88b4ea19. 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/DGA0R2328368.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1508258ad80c9099c180acfd96e460527946b746dff83a084fa0015e3575f06. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/DGA0R2302698.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ecd755c28f586e2e81232fee3aeedc6c8f6c96baddc85ed7afea945f8d5d829. 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/ING212342574.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe04af06864d847882e2372cc096e0f5d88471c2e1f60cd7578efbfdf2953f4c4. 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/ING212343351.