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 0x8bcad43277982ca37bb4524d25e0e6b2f00b4dc9aa7f7e413a207f60cad3e3e2. 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/6ee4bc48-c453-4d83-a23d-66047be813ca.json and https://artists.proofprofile.net/proofs/artist/6ee4bc48-c453-4d83-a23d-66047be813ca.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 0x942a9b91dfa176e2683350f5cb043eedf928edc98a3a733e97ec940b74f610b0. Chain 2 (Bitcoin): anchored in block 958563 (2026-07-18T14:29:03Z), 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/QZDA82184392.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x234ccd6e6951b7a4e5bb450ff50f3ab512d672277a740bdd263322eedbf4ea1d. 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/QZMEM2126177.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e923e4ba915b1e348001ac75b2757370624c167f1d6638546a1f510038a9fc6. 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/QZMER2179280.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60786490293ab63419cc6b4f3eb8806427ce09931160e69166bc4d6203f593e8. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/QZFZ32202522.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12fa0ae4136c5f76c996a33ca5b0f6e061a090802e6029cde50c16f2f6106113. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZHN42286802.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1deb249779db6386d0e4c03c3f7064af60d5097f1f6e45bfd7376a8348cd36c8. Chain 2 (Bitcoin): anchored in block 959031 (2026-07-21T16:15:11Z), 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/QZHN72275836.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x745440a7ae2adfb4c1583ecf9ebcfeb29d25d280f52ac59c6e88d2c1317df9f7. Chain 2 (Bitcoin): anchored in block 958355 (2026-07-17T03:11:50Z), 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/QZK6P2245061.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e34eeb1b68e3730506c4a4610d400b9704e3fdeb6f3ee505231388e83d610c2. Chain 2 (Bitcoin): anchored in block 958846 (2026-07-20T08:14:15Z), 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/QZK6N2211501.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c9d92f59e2acbca936bd1ea54482fc7438d7d613e8b66ee2ae42c7874850c3f. 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/QZK6G2204539.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a8f9e15d948335443d8c41e6def04cc009fbd42bae6bb23acbdbf8691943148. Chain 2 (Bitcoin): anchored in block 958805 (2026-07-20T02:22:58Z), 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/QZNWU2268637.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0acd59f1c0697773c2de95802e404e9910e71039d0f6040739c1fb4a3aab76e. 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/USANG2216563.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ebdabfeef3bdbf0a7cd46f704171ff2a7cec9c6ec0ec2f154da9fff39ae258d. Chain 2 (Bitcoin): anchored in block 958410 (2026-07-17T12:18:07Z), 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/QZTB32239673.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef8edbef203434063bf53a17ea70d6a39e2c1de9c3d1a0cc950cdf998df44fa7. Chain 2 (Bitcoin): anchored in block 958218 (2026-07-16T00:33:33Z), 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/USANG2246541.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf64c8751ed1322e3bd4b78b97129aed549fa2bacbe8868917141fd46210ab50a. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/USANG2214318.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd50ce8b7c868258b48c75905a5a786fb70c516ddb4224227ec83cb8375b7c640. Chain 2 (Bitcoin): anchored in block 960220 (2026-07-30T07:28:30Z), 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/USANG2214306.