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 0x901e9db298837da60cccbb1c62105328ce5bef70fdb747e137fec640cec882d3. 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/bb43a497-0b41-4b78-ba44-9d1923f06e77.json and https://artists.proofprofile.net/proofs/artist/bb43a497-0b41-4b78-ba44-9d1923f06e77.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 0xf3fae93c7cf24618ec4808ac680691a24bc7352042e56bb325984558ecfd9f6d. 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/SE6QE2459802.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9ca381ee991758132389f2fa6b4dfbc6c342fe61ba8aee9673a5fe784667265. 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/SE6HN2455198.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5eb5dcd2d9518a7bed14cdcdc23a7dfce317ee405941297390b492357059e7ac. 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/SE6HN2448394.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a6c4e4e176417ad401c50e2e4fb2c318939561b5c8789c3e1d936deb67244db. 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/SE5BU2444430.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1dbbc71c4994bd91cdc449f7a6a75d8d7bca326260fbbbaeae786cc15a6414d4. 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/SE5BU2436744.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf066d672b965c18b93ef2b3f06bf70b25198a309d3e057dd3fd54ea61ba09f2f. 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/SE5BU2437690.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbcb0c9449e2581b7d9b7a7d3c023e2f7b22589e6c5b803b0db756b678e3657cc. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/SE5BU2433216.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x952d6802e1a97190a2a5015eeeb788afaece03af729a7b88fb192d982c81ffd5. 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/SE6A92378674.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6898ab01af5804c0f3a3fd3640bce87addd3d51dd60692ed1c41db0e9a7bc258. 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/SE66N2329494.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd36ac40a01ce06e980b5b0772c9c5da5b549ca021dcb8ba4861cf8be2800edf. 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/SE6A92374946.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41c9e83ccce5586c6fcb00b8c019a5caed41a7dab7e04bf7e4e3e9418617bd27. 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/SE6QE2352794.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x242eb5fd3347c8c8bb7d60d0cd0c90ff6f4035c45edb678690016fe7a636b450. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/US7VG2366732.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85ddbfd93f7aedf5b1ae2b9961fca97d5ea7ca759449809a663514305e75bea3. 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/SE6XW2297276.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac43e637c3e27e30a71306de64f992999d858d6346d06f6bfb2a8b058852516e. 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/SE6XW2296902.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa66f9b655279bfb5af7c4b8ae246dd1244d6d0adca661cad5e52cacf07895984. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/GBWUL2208642.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef025b031533fd6684c43a309fdc98f46133eaf58e55859e64c46035871ab011. 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/SE6QE2235815.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76e4568e3761098acf18fa057854c44a62461779dff57026aa41f340fd18549d. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/QZHNA1991151.