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 0x57be6d14fb81ef7e5c676a84cecdb5a77dbda672a42498bbb0d37ad5ed6768e6. Chain 2 (Bitcoin): anchored in block 954346 (2026-06-19T03:51:26Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/972ecfaf-3fc6-4f4d-b356-5c4c6e1065a9.json and https://artists.proofprofile.net/proofs/artist/972ecfaf-3fc6-4f4d-b356-5c4c6e1065a9.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 0x97e27741375977608da955c92d47a710f9309837881c0b7b18c9b59b7e633d08. 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/DEH742300906.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a98eb6e5f6224ebe88690c577d0a4e5454dbd9b16fd77fd9ad7260f1039b515. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/DEH742300907.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6bd461dcf832f749eaa245c9509cfa6eeaf29e32836d4f70bca95ffa264f2a68. 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/DEH742300911.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x104d98b2f14d820d9ca212661109f78c80d159a5d5f889295ec0d82b9bf4fb8a. Chain 2 (Bitcoin): anchored in block 960145 (2026-07-29T21:13:37Z), 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/DEH742300920.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50026ec61fadaf2d39122505f1ca75851bd761d8872c0b46d42562124069bab0. 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/CA5KR2118409.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72c51b0436df3c16bb3db498b0223cb9d82201fcddc550bedfebda82291058b3. Chain 2 (Bitcoin): anchored in block 960210 (2026-07-30T05:21:45Z), 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/DEH742169015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98e478e0e988077a708f2d79dd6ef91bdbc1766e4b9e1c3aa6bc4fc6a8a731d0. Chain 2 (Bitcoin): anchored in block 960258 (2026-07-30T12:45:34Z), 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/DEH742169016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8bfc3fa140a57db1f014a280708663ca14a4fdb2cc68a6b4fe5da000bf7f1f64. Chain 2 (Bitcoin): anchored in block 960258 (2026-07-30T12:45:34Z), 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/DEH742163731.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d1909dac55344cd6bcaa098bc6dd709685e1f44c45fd6bb89bfbf2532e46e42. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/DEH742163734.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xabc75ca2aad1a179bda1a81ed4bc4e8eab7ec685b11564c9f2bf51ccb9ef4af1. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/DEH742163736.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8849ca2ffcf23f5818a9188c4eded2879dd3479551265e61acb3bf39460d1ab4. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/DEH742163746.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a20332c7753a6b3866bd3239e86d5ddb046a185972576226ed02e965dec25f4. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/DEH742163747.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x932958f06aaebd6673dd43756a414181dffc08ecb96f84d7fe086eeefc796a08. Chain 2 (Bitcoin): anchored in block 960294 (2026-07-30T18:46:00Z), 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/DEH742335423.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30e1db769472b271424085c3d2e9b37e55947baf761dfa67f2b7c9f759510317. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/QZG2X2412871.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d14f458fc6f3ff94908b6f0f1762fc245563a1e65c9fa73dcab7e03181c457a. 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/QZG2X2412876.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69ac009f93128d0b7e7e24e7a1973fd8d4efddd00d69348761f307f78f43ada5. 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/QZG2X2412886.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16cbb72aaf7109fda1cae8888854fe383c07b4cd9000b423f7b4e6b3dd23ad61. 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/QZG2X2412887.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd76a9c45cc46a4579e64caa9f1f9982e8d60db31f3056892b177e0a6a34208c. 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/DEH742411674.