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 0x252185146ea34bfa266eaddf769c5843a61d6e53589bfe6b83ddd0713866718a. Chain 2 (Bitcoin): anchored in block 954615 (2026-06-20T22:44:50Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/c67373fd-e232-4323-976d-506003847fd7.json and https://artists.proofprofile.net/proofs/artist/c67373fd-e232-4323-976d-506003847fd7.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 0xe982e971e231d66d0374e7355e60f3bda2ae86cda0c3293b1d6766c4c978ef5e. Chain 2 (Bitcoin): anchored in block 960337 (2026-07-31T02:51:48Z), 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/GBLV61925031.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf758abba96a9470ddb999b52e2e3a6b624cf50d7bac7d04752ac5c2959071130. 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/GBLV61925034.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd397cec85def74e1261d849213e9adc8627fc040445e2c4796cf9cd105cc1a05. 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/GBLV61925037.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09c88d0b6f70406b8547ffe37218edca8f9f8c31dd8c401e5399222f8d132ff8. Chain 2 (Bitcoin): anchored in block 960163 (2026-07-29T23:20:38Z), 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/RUAGT2425156.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf501a51e6bcbeab5fdd9474f7d61e00b18f450f0b83d9f76173760e85276889e. 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/RUAGT2425159.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa887eb78b5351876233686957fe613749d558482b011d391421eb09b6a3ba78c. 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/RUAGT2425160.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc344faf03cb8032feecbc1607e3b15d0a243e12cc710e84485da0ee56c6ad61a. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/UK2BR1400108.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x284d62d62f74bba7ef00715d59619e15814e6ae73b393b284742c52a7a8cc40e. 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/UK2BR1400109.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac42d0f66bf3812e085270d7682d6042c1de8f98513b3c4ea94bdf9ad9e4057f. Chain 2 (Bitcoin): anchored in block 960337 (2026-07-31T02:51:48Z), 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/UK2BR1400110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f269fbabedd62a06e17ecef24813c7ae3b0d455fb30673868eedf8e4e3e6890. Chain 2 (Bitcoin): anchored in block 957064 (2026-07-07T16:43:08Z), 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/UK2BR1400111.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49b18c429d0ba06eac05f5387c3c3a9400d9def128f9ed44942f738d09c57089. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/UK2BR1400112.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x350907aebeab6663edbd117a6fa31e0598f1ac6b634ab30f8e9cba75b65b9cc5. 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/UK2BR1400113.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5dbf5191525249c332b8589f890ef42695f8f4965efdfbb2340edd486d89233d. 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/UK2BR1400114.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95dbe80d53e1783e50e69e0c43814c8e6a201f1359a296296d5b684e30d4c40b. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/UK2BR1400117.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd348c180eb67449e9c8771f3a8193d775228830b7a793f403822187eccda4279. 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/GBKQU1570985.