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 0xd2c13504e6eb192c8b64772f2fca8ebf635ee40da6b31fc44970b461c92ee44a. 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/bad7e3f5-f109-4a2c-bb49-399410d13d48.json and https://artists.proofprofile.net/proofs/artist/bad7e3f5-f109-4a2c-bb49-399410d13d48.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 0xad6dea66ac667e76818649a4820efb0d04d093824aba784b492f6bb754db3904. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QZWFJ2331197.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8323fd3f5e5f0bbcd9c60cd8259175a5fd527f3f2e6f4afb5fffec8ef9c3fe77. 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/QZPEW2448497.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3ab29ed79c45f542529b79544340bdcefd618525e5e023e2a423b47701e487e. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QZPEW2448498.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0fcab39cf670e6041b1416f933116314348109c1c47efc532f192b7be668ae51. Chain 2 (Bitcoin): anchored in block 956440 (2026-07-03T04:03:57Z), 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/QZPEW2448500.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c934e0be3bf25cd9beb2d7d579ebb68f3591e809392aee1cde3076a74f24a17. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QZPEW2448501.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc3b9e80b68f6cc6d01552e06682b4377e32ae34781118759648a75c81bd12a2. Chain 2 (Bitcoin): anchored in block 959073 (2026-07-21T23:25:37Z), 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/QZPEW2448502.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd65c8ae18f5e728e1ecb0f8889671e5d256047352efdc05ada185fbfe91fa2b2. Chain 2 (Bitcoin): anchored in block 959089 (2026-07-22T02:17:57Z), 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/QZPEW2448503.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x301c4f8f5df4a931c72699c0b30258e7b487bbd702d50c7e847e4d44a2bb145c. Chain 2 (Bitcoin): anchored in block 958054 (2026-07-14T19:33:24Z), 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/QZPEW2448504.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe370b90a623242c89ef755d43ee5c5ab4a2f4731ee1c3c5dab8d5d6a6253869d. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QZPEW2448505.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd90789a87114135916e1999945bbec95526dd578a0a511607dc6a3abca558e85. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/TLVEM2467829.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48a9f082fade1feb75f5b7218f90fa212ae2fee931fb6969ca7042b17b5036fd. 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/QT2VB2441293.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22af10ea9d736d5410f2b54e40f416a3249f36a96a355ef62f8120a445f80283. Chain 2 (Bitcoin): anchored in block 958436 (2026-07-17T16:42:22Z), 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/QMRSZ2500022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f1a959644e702b7908a59d587daa3371cb257e8f6bbd4d615a246ce087c5643. Chain 2 (Bitcoin): anchored in block 958086 (2026-07-15T02:55:47Z), 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/QZVEM1810655.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6d01cd41dd690f7efa690b4d367c98334ab30b5845cc248bdc18daf5bee03b1. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QMRSZ2500025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84f2794a4fae4c6cadb4011f221ffb2b13697ec4a757da53c066f07cb566f63d. 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/QMRSZ2500099.