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 0x37cee469b62fb3854b62a6c43681e351ff7ef54ebdd62e733c6b43291a48fbf2. 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/cee0bb3b-425a-4da5-af64-e7be4531528e.json and https://artists.proofprofile.net/proofs/artist/cee0bb3b-425a-4da5-af64-e7be4531528e.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 0x8d1d6acdb215ce753119950b7ead7c6565667d939cff94a425ad33e0f2701f07. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/QZFZ72033631.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed2e0a5cd1fc6bf3e53a70d9a4332e4c7bb0d7862d5cc6d888139e02b6afae40. Chain 2 (Bitcoin): anchored in block 958541 (2026-07-18T11:37:54Z), 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/QZDA52014657.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcae87a8163d76765108cb35c23f60ce84cdce929b6999708373f1dd8ee22098c. 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/QZNWZ2062786.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x644e6c101b76857e1a7269a1e9224ae30979b8b3c8ff2753ec31061ae8898bd9. 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/QZES72087166.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc631d5e33d55496465dfd9b3b90b2ec390ac850fc1394af89a55c4d627479c03. 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/QZHN52005318.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca50ac4ef3fc4616eda2fc9ab06e866022c7bd857a0a8e7c033ad626604806fb. Chain 2 (Bitcoin): anchored in block 958476 (2026-07-18T01:26:56Z), 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/QZHN92070765.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63aefe5b844305e46404333a8d71a30a57bafdef7be4df1de1945234e9af3783. Chain 2 (Bitcoin): anchored in block 958746 (2026-07-19T15:36:35Z), 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/QZK6Q2048909.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x626c385ad3d9be9769f8d94a99081d056574e98624a876d7eb67ed2dcdd68196. 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/QZK6H2029065.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7cf25406989ac6e82992fd90cc7c98d8b0a1bb5a2569571cb5ef23570e7536b1. 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/QZFYX2175019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfedd872716b3c17b9769ee65d9efba59f36c0dd1e9db9b9948859ef3c061a5e7. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T13:14:32Z), 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/QZES62185403.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23b1979c9fb2e80d7417cc9c61638140f8d5fe7c34b7fa3da42a30cd7ecaaee3. Chain 2 (Bitcoin): anchored in block 958541 (2026-07-18T11:37:54Z), 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/QZHNC2196506.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2d950d512cb761595b2d3443811f5e2cfc311f23ec5ad2b3b5f6986984b365a. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/QZNWR2190865.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x291d4665e110a756628254876b9a6d586bbc1350d5df3c97c70ae0c8261ae6bf. Chain 2 (Bitcoin): anchored in block 958058 (2026-07-14T20:20:34Z), 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/QZFZ22227726.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18b5cfe88b513c70ac2f9cc16cc4d5d3e57394fc7594fb1c00b5a7b6bb8ac8ff. 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/QZDA82281927.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d1cf1f5b2f0f7d43e7200dc21c643095e5a58c27f2a9c98ede4c591ad6d3643. 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/QZK6K2255825.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x519fb54863a14fa6f0c21b94e11e506de7aba065ceea26e8615e3055c97468ad. 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/QZNWT2247446.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa63a2f20d6d464a396515bc536808e04a49af16a98f856474b7f74be41e1c7d. 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/QZRP52254524.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ab81ff20068c904966fad1e682419ddd4f7542307d41423664f536d39c080cb. 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/QZTAS2236108.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbaf138e174526028159a75ca6bcc4edd44bd9f468f6a9f951e50350da3b2455d. Chain 2 (Bitcoin): anchored in block 958473 (2026-07-18T00:52:36Z), 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/QZTAU2221131.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf441cb0dd8fa3f7e391fa29cf7c0db26b0ff29c86e5fd1dc739bbb6e96ab50b6. Chain 2 (Bitcoin): anchored in block 958246 (2026-07-16T05:55:09Z), 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/QZTB92229514.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09f1cc6cee008b789ec051ed66b58902bdc7afb35b7ea6abd9176ea176ddef8d. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T13:14:32Z), 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/QZES72386998.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e14b94977297b86bc719bba4feed1baa8a5e845d3fce671fae98b5578005ba2. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/QZHN52320286.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a052d96c3b7a1f122665a69d0b4aada20de0c223c24fe1e137f49656132ddb1. Chain 2 (Bitcoin): anchored in block 958208 (2026-07-15T22:40:25Z), 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/QZK6Q2310235.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e14b94977297b86bc719bba4feed1baa8a5e845d3fce671fae98b5578005ba2. Chain 2 (Bitcoin): anchored in block 958208 (2026-07-15T22:40:25Z), 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/QZHN52320286.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4fc69f3919a8f3b730b9a1d6e5f1fa7ea2f0b5e82ba6319f35af3da5999e9bb. 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/QZK6Q2310236.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53ebca5c90c78b1d2e716bc21e26d1505c80314273e2c01e5cdc16a6f2ec1c13. Chain 2 (Bitcoin): anchored in block 958245 (2026-07-16T05:50:22Z), 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/QZK6Q2310237.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c34ad753c51782bb1dcb4f86478e693e52f080b25b71fab44e28775243d6de7. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T13:14:32Z), 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/QZK6Q2310238.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5f6ea1dd3e892babe3f3a8a4ecfd8eac5ce0401fedd2f073bfc8e65fc504434. 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/QZK6Q2310239.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7284041b91ae1539508a63d9f4277fdf53aa5be7dc1d80c40ebb04e2628fbc44. Chain 2 (Bitcoin): anchored in block 958473 (2026-07-18T00:52:36Z), 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/QZK6K2426731.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40a21d4e29363b857281b889e54b71f32fd5727b5259d7da74aaa40a992574f2. 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/QZK6K2430232.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04d316729fba6dace60d6436be89fe4ce7a6c4475394e7fc9569cf65f4182629. Chain 2 (Bitcoin): anchored in block 958152 (2026-07-15T12:00:27Z), 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/QZTBE2406482.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xabf9e01d1382331602f3e3eaee02ea94241eb0b5f4df8a8d7412191a074c5e0b. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/QZK6M2289377.