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 0x5d06ea1734e208cc918f997ef336dd06002a9dc958cf0712f8669420d3346c2b. 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/372171c4-a330-4625-b493-e0fcf5eedc48.json and https://artists.proofprofile.net/proofs/artist/372171c4-a330-4625-b493-e0fcf5eedc48.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 0xf80d7fb1aa4ac3d82a2f769937036a046b05a3050928d4809b9af635f5381dd6. 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/QZFYZ2055451.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf6bcaf2b3072ed4edae7bb4eaac838fe9b5a3cacbcb158e6fbfa0b6757df8fa. 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/QZFYZ2055452.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11f0e27fa07a19255a3d360efa6d41c370002ab5273208c325cab236c07d97db. 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/QZDA62080484.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9dde82bd901bae110b90d8c8f2cbac6b10307cd119965d34e010fc57d3fe9667. 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/QZHN42021238.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6384571308569c12d2ecfe461828c54fcdd54615e541a297752006805574a8c. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/QZNWU2005791.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f7b29acb321db03217d82bd87d15390b8e8493575c9369d433764f3dbacf1cc. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/QZNWU2005793.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04599e24a67acac48bd4e6f62cdc41fe6ec759e0a4691ff805ba744ac59deba5. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/QZNWU2005794.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff8be006314d983a9b5d481f049b5082301d427764d19f526404d8bb5ca996cc. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/QZNWY2049116.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1145b8e0cce2373208296999c22a64af54a2b495de2ceae5be3c409697f42b8d. Chain 2 (Bitcoin): anchored in block 958907 (2026-07-20T16:17:58Z), 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/QZFYX2115214.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x388219c7246aa0bab8867809b9398f1aa25f70adf538a8160a2a3d0e0bffe11d. Chain 2 (Bitcoin): anchored in block 958153 (2026-07-15T12:03:04Z), 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/QZDA72133148.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3da0141e3d8c8f2e1ae3c088de5533f8d099c3b80bcdfcb625f276da3c0f86c2. Chain 2 (Bitcoin): anchored in block 958140 (2026-07-15T10:05:23Z), 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/QZHN82166349.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89c8cc77eb0c72b160a61ea85bf11dcd55029d3a5862d08c280c3da6bd6ae68b. Chain 2 (Bitcoin): anchored in block 958544 (2026-07-18T12:14:37Z), 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/QZHN82262562.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8f0abb8fa0c5ac08a238b903bd03c01337f57a0a5e723f9900938a620290df6. Chain 2 (Bitcoin): anchored in block 958917 (2026-07-20T17:53:56Z), 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/QZNWR2117694.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87021282ab507e0cf6338b6a8c53735a71ae540e913c7fda4daaef0b01e749af. Chain 2 (Bitcoin): anchored in block 958106 (2026-07-15T05:35:13Z), 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/QZHN82262564.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3cd2ff008bf12dc5a27ac6d2fd7b56669285e9f18faeabf6da4befc8de14b489. Chain 2 (Bitcoin): anchored in block 956396 (2026-07-02T21:01:51Z), 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/QZNWY2202804.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc50c12c94d1d562e22e79f8b56a2d27b5ea034c2735ca1ca82bf1f24484ee6d2. Chain 2 (Bitcoin): anchored in block 958905 (2026-07-20T16:14:34Z), 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/QZK6F2367068.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeee9c63b61472b041376504cc148ec1791d6deeaed3c91c798754c27b5472986. Chain 2 (Bitcoin): anchored in block 958653 (2026-07-19T03:54:23Z), 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/QZMEQ2304622.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50e3b66c18c8f31f6e6ddc2e3e705fda5468717023e9ca15e55266b9a15c18db. 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/QZNWW2398084.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6cdf90bcc8014c4803445bed3b3e298b8a0084bed03add2f82e4173848f86386. Chain 2 (Bitcoin): anchored in block 958959 (2026-07-21T03:51:22Z), 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/QZTB92372150.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5cf557b2aad96ad34a67b7824f6ed0a464798bf35671a706aee4b34532432597. Chain 2 (Bitcoin): anchored in block 959001 (2026-07-21T11:41:42Z), 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/QZES62432642.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf37c8084ad047ecd5fc287b2ff218ee3d439062449e703612f1a8af81fa7726b. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/QZK6G2428534.