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 0x535c3f14e2e45d69e542d7a06a36cd600b90e54e1fcc51c94dfbf2339cc950c3. Chain 2 (Bitcoin): anchored in block 953596 (2026-06-14T06:21:39Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/0b6515a0-ccee-4778-bd9f-443d855c4155.json and https://artists.proofprofile.net/proofs/artist/0b6515a0-ccee-4778-bd9f-443d855c4155.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 0xf0a3652f9cb5d4c3835176ab374926995b7a41ac265f88ba15619795135d1798. Chain 2 (Bitcoin): anchored in block 958793 (2026-07-19T22:59:45Z), 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/QZFYZ2428102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41a8965c0d196146e60573fec0192ed19356bdc3a221d404d6febbe3cbe7318a. Chain 2 (Bitcoin): anchored in block 958802 (2026-07-20T01:04:02Z), 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/QZFYZ2428103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42bdbc111296d8c878addfd012d544b9a0e55920774ad45062eee13dbb839124. Chain 2 (Bitcoin): anchored in block 958552 (2026-07-18T13:15:29Z), 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/QZFYZ2428106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61d2814539f31be2de21671514e83db280a96cc2b71834039a9395c9703f5153. Chain 2 (Bitcoin): anchored in block 958749 (2026-07-19T15:48:23Z), 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/QZHN32426880.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8cd09dd9231b28fe17bec3064df6e4f0a9db9fc3884443bb070b53b6460716f0. Chain 2 (Bitcoin): anchored in block 958850 (2026-07-20T08:32:30Z), 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/QZHN32426881.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15f227258f2a3a34f3eeb30c13c8b82e3d0fedf414f056a5d9d9761a8359c760. Chain 2 (Bitcoin): anchored in block 958722 (2026-07-19T11:03:50Z), 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/QZHN32426883.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4525d4ced354bb38457044241258c8b52ee4e8adec35db4e850f89b800175ccd. 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/QZDA42443997.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27f3dc5979a29e1eec52cd89395eb0390f0b433bca65408fab80819bd99b5985. Chain 2 (Bitcoin): anchored in block 958793 (2026-07-19T22:59:45Z), 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/QZDA42443998.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7a5b5d0e9dbc71de09838b95315076f11e7028c4ae3208465c97d238b2b8bc8. 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/QZDA42443999.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21cbc4bff207feccbd758da50ae4631cfdd9f302e7cb08f7ca30485086e3d7b7. 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/QZDA42444006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61e535e3bf98600a8c4f16df48f62faff55a1509efa6ed45d138e5eaad999e5c. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/QZDA42444009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd54160c785fabad8be91b0125572e1bf9dd4e89839727c29111efbace2acfebe. 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/QZES72434574.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4588ac645e9ba63183c5b28f8d3d4ec9a78d8d5167c1682a96414519ad37569. Chain 2 (Bitcoin): anchored in block 958376 (2026-07-17T06:41:00Z), 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/QZHNA2409728.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb71df383356e105824c6b6d25fda3e1a1247df91d24eb761ee1bd202b5f372e7. Chain 2 (Bitcoin): anchored in block 957770 (2026-07-12T23:17:00Z), 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/QZK6N2417232.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x098ea1e6afaf5e8b4b33ac47bb9109dc785c948a260f272c40943e3f4be4254d. Chain 2 (Bitcoin): anchored in block 958802 (2026-07-20T01:04:02Z), 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/QZMEQ2442486.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51539c6e51caa0dc56b703ebec091c92e655f0146255f2b10e342708026d1569. Chain 2 (Bitcoin): anchored in block 958857 (2026-07-20T09:45:25Z), 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/QZRP52400697.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb854db52d1dbae87f41a109b075c1541482a668f24d4921f99a4ddc93fd70a04. Chain 2 (Bitcoin): anchored in block 956745 (2026-07-05T05:33:35Z), 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/QZTBA2420947.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7e1becf58edc9f818ab3e6e27fd13b9f7b36146a9906d264d7463032cb3d5cc. Chain 2 (Bitcoin): anchored in block 958817 (2026-07-20T03:52:09Z), 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/QZWFW2468045.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4dd48442d6315af06c6a38d8a134eb51fac6caa41a5b491b8427e072f56078d. Chain 2 (Bitcoin): anchored in block 958366 (2026-07-17T04:59:09Z), 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/QZDA82553457.