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 0x42d65fa3ddfa3d65d9c44c2b1cee47e3a423720ec09002c5364f12805715ffab. Chain 2 (Bitcoin): anchored in block 953605 (2026-06-14T07:39:50Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/11745073-1ab9-48c4-9313-e93c932566a7.json and https://artists.proofprofile.net/proofs/artist/11745073-1ab9-48c4-9313-e93c932566a7.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 0xc912b5c0ddcdd8e3eecfc6b5a7890bddf6a876621f6f57b4543ec5bb829da355. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/ESA011817771.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4115454cdec8ca096b7d885158d5a88cc9f509e2ac2e7b0f06b4d54ff7b8615d. Chain 2 (Bitcoin): anchored in block 960183 (2026-07-30T01:10:20Z), 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/ESA011817772.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xafc20e32d1ae5b980b15d7bafa591bfd25a228f874b54b14de39d1b33d1e1ad6. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/ESA011817773.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29e32d55538735aef49773ee903001375595ecdef15df7d62616a060f0458460. 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/ESA011817774.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ab9524bc8aa92c5f0f6bdef246116ce25a60468194fcd699461d9a280c5374d. Chain 2 (Bitcoin): anchored in block 960349 (2026-07-31T05:23:41Z), 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/ESA011817775.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd140ce2b8c73abd644b44ce5c69df654147edc043acf9d358efc6f0217a9ea2d. 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/ESA011817776.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5101d2a563fa1c1f3baf408fe6cd8c790c5a92bae727018798cd99b2dbe8df6a. 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/ESA011817778.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2aea0f3adacb053ab1f5837f03b0f44d79c5b8065c86c322cdc1ab39d8fbd61b. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/ESA011817780.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4dca7970ab30b3902644286c12b143597d8ca9011dfd2d362d8a9900c69d1bd0. 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/ESA011817781.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f4ef3cf1f045e48e588437dfd109e332f35992b18b6914bcc2a0bbfcf695fa9. 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/ESA011817783.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47295e7ed004ec9afaed859211e76681a01b0619f7b0186ec58dcb38667399b1. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/ESA011817786.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40806e4958742dbb33989623b11535ded710dfc51d8d68b4d8a8dead50505ffd. 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/ESA011817787.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48c2324d6308a0e2da1ffdf070bd235695ffb5f47b26dbf3ffa59584ebf02b25. 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/ESA011817788.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x846ab0023f91c8bf40fead6633f1f499ed2585f47a503d53c51a7bc753743bad. Chain 2 (Bitcoin): anchored in block 957025 (2026-07-07T10:59:31Z), 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/ESA011817790.