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 0x8a9e1aa8534a96481b6dc9cc289791c1c64de43de18e82d5e9f570a48152636a. Chain 2 (Bitcoin): anchored in block 953684 (2026-06-14T19:51:57Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/6683ea44-0d19-41b3-9248-cda4323b8918.json and https://artists.proofprofile.net/proofs/artist/6683ea44-0d19-41b3-9248-cda4323b8918.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 0xee8b84b67467508e57346638626d8502f224b0eca21d63ca8d120f07b80053d8. 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/QZNWV2078910.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ea84a846ee19e51122a83413a6e8ce884571ab42bc3e06f37643c7a2ddbe572. Chain 2 (Bitcoin): anchored in block 960370 (2026-07-31T08:38:45Z), 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/QZNWV2078914.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d864049214417323ba3958723df2a65bce6cc1332bea00de931b457f179083e. 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/QZWFF2403445.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb85b914c0426e47df5eb031f0a7a2a67fc37b92f929acdae7b8469d7696ccc92. Chain 2 (Bitcoin): anchored in block 960218 (2026-07-30T06:57:05Z), 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/QZNWY2467744.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6730d2caf76814a84876ab71c10c702fe956e9eef1e0c4dd3fe251a98ee20272. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/QZTBF2385573.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9d79c8115023f7a97692ae7eac0453806b9d5d2c823dc69cec93399c708b3b3. Chain 2 (Bitcoin): anchored in block 960340 (2026-07-31T03:15:04Z), 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/QZFYX2204668.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x901a216eb36b04db465ba75918ff45a05138eb47526e332b5ddec32455dc5061. 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/CH7812214239.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86569e4a546a8b85893e993cd66269bf89c1b2f13ee13e22f667ec89e07cda57. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/CH7812191144.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0fd012bea177f89e0915174ee3e1a55bfccd8709197c2bdc61f0abd76f5683d. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/DEWE32100012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1c73f033b5846d38d518404d28b5e808efc56c68b0e6b57d3b9177c053c1935. 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/DEWE32100013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9eb6b04454c7bdd9b6da176fc6e8f208cd042dac9073745a16761730d5e4146. 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/DEWE32100014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3fa3d7712aae74203554c3924a9e3de16c38ce71bdde44dcd1c52abb8706f38. 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/DEWE32100015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5fbf17be21f1a42e3a4dc191a00cb6eb74c1eea2d3cb7b25d00fcc1fa533e462. 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/DEWE32100016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd932a75898f5cd73020c65f462d9420bdce6cf178e34e9c536c47fd4d14d395c. 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/DEWE32100017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27b313c45a5cc82e484afd49712a8a93f722f9b1296e6ab79733baded9ddd847. 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/DEWE32100018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34445854a8579c8b5273a6f7adc28998f5aaaab895b05823cfc9061539df584d. 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/QZWDW2536177.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f1d5e170229521adebbf7a661655a034e0251a2236eda30aef1ddee245c5763. 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/QZES82511418.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5a570b147f84878355b522e354b8a21ea05dd1f9a448333e361012b6ec5057a. 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/QT3F32480971.