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 0xc137e0db7c6f6bca23911d34166d55ca53aec7f51bc0704f167bef90557e8c58. Chain 2 (Bitcoin): anchored in block 953742 (2026-06-15T04:47:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/8fd52a5b-439a-4180-b3e0-1e32b3988f41.json and https://artists.proofprofile.net/proofs/artist/8fd52a5b-439a-4180-b3e0-1e32b3988f41.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 0x486e2739484306f61515d49eddbd793b492124b72fd455aacd5002356de8d0a1. 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/SGB502236791.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7cd39b2c6fa3832adf58559486d14f50464d05afa6142e0b05f61a71a6d36dfa. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/QZ5AB2348359.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea9880e29fa60ae3addd6e507e9ecc86c6ee450e8507b8cf86534ca613001c3d. 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/SGW502322695.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ed920af81d32c4b115036f43db96d53e21ab7b7c94b62dcd9ad6551165bb5db. Chain 2 (Bitcoin): anchored in block 958728 (2026-07-19T12:24:55Z), 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/SGW502327536.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x594d9c479bcd5697a479092cb5a528307ae4b845fe55125d511819165638fc75. 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/SGB502471420.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdbf945f9e300aa84c81cd5576bdf54c9bac0c78a280fa3a98da2ed6e0a016b21. Chain 2 (Bitcoin): anchored in block 957882 (2026-07-13T16:48:10Z), 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/GXD7G2489272.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfbb310a5b62b1cbdeb20b11ef424ef6372c4bc676f294f36f17c2a2508eed0be. 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/GXD7V2328755.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe39b60edaeb4878d6531e98b84ecf3f4c4e318264a1e11b2dd87bca8df213abc. 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/AEA3A2317469.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4c6bc92cb9e6e3125f090bdfd207d6f105e8aaa11ee9af4df866f29acbab474. 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/AEA3A2356612.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69f4660dfbdb6c56b1264454f19d4c45436dbfc2fb8d5a472c25945c39ffa3b2. 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/AEA3A2370744.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9aad18be4c1c6bc5c92a992e862f20729b02f782bd75807e8f55d36a8de95eaf. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/AEA3A2324379.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5b01f12d368dcddf355943b2920a901974dbea6d6c7e752b03a754e81e5c3fd. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/AEA3A2350862.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d02b506cdd63448978a645327c6c517d4af874b5c4b6c2f88f00ab1580ba60c. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/AEA3A2365607.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeeb004934d553250cf1163ff6c2b55d6acfcc2bb8c4436dcbbd7e214ddf3f1a3. 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/AEA3A2363818.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c0e35c35f10ddbc08f59092b4bffcb5da4dfaecc0083b11ccf488839cda9e1e. Chain 2 (Bitcoin): anchored in block 960105 (2026-07-29T12:35:17Z), 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/AEA3A2379948.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f63417ef5710119dafe716382062a8c0bf7845cba3bb842b0ebdf42bfd5b9b4. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/AEA3A2388698.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ea92bf2685e173e84bcfed9bf6ffe72c4507ab7aecccae795da87a9a7d8f51e. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/GXD7G2253656.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f251bf2fbbdc5dc94a2e15b0c1aac36bb2bb61fa503babd9d73851f4eee2000. Chain 2 (Bitcoin): anchored in block 958371 (2026-07-17T05:45:43Z), 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/SGW502570578.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a86ac456aa843261dbc7e32d7c74a58b18a8e30a3a0ea667f9ceb3618d59f10. 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/QZGLS2345487.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21051541f49f9ef3fc5257791dcb49c0aaec165edbd788898bd01d4f3a860ef6. 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/MXD782202826.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84b5d696e35c2ab1d5963b7c08287c2e5e63fca0092588e4bca44bfa294896a2. 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/QZHZ32252368.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb14f74dc0d672c6232de91adeff6c41b342f3e19ce7b4580f74f4cc843135c7. Chain 2 (Bitcoin): anchored in block 960150 (2026-07-29T21:51:49Z), 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/USA2P2235739.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d95e0bf1024469f1cca82c4e86130b023ba73fa7f55a29cc24769fe076d9075. 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/USA2P2225140.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb712ad4229e33f7076317dc6ba8784ce52b14cada36d43fc4b54870e32c72cff. 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/QZES92297178.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2a69c606e7e35ff16d9e6dc6b0cfc86ac005f2b676f2a0fad9eb854f4731eb4. Chain 2 (Bitcoin): anchored in block 960250 (2026-07-30T11:13:28Z), 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/MXD782202625.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d38dbe63a5db88cc9a5e85407755bf3e083047f0b70c3828c5938cb4a9cfb8a. 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/QZTPX2385895.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcea357610a547a6dfc0f95f4cc860337794fada667c4672d7cff247aef34dc73. 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/QZTVM2435399.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa336d4e9e9b1a02665d9c45cde07967c44cbecd209a2548b3144eef81defa1f6. Chain 2 (Bitcoin): anchored in block 960160 (2026-07-29T22:48:59Z), 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/SE5BU2482634.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd750ff0ac69df072e5e0a7798caff8d2d48dd2ef1aa63885fe65fd77b8bd2f56. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/QZW9N2265710.