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 0x5f117abe1e2c333c847b92c512411a52c009f0c01ce8ac0119e8ebfee671b75a. 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/7af2075c-7a42-41d0-9ae3-5ff224bbaf71.json and https://artists.proofprofile.net/proofs/artist/7af2075c-7a42-41d0-9ae3-5ff224bbaf71.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 0x0243919166c2056e8b459052c31be3f7afbce93c9d0dbd9b6e4acbce800dd531. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/QZK6N2169912.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ddf5093363e9635129d619b3a634eeed4da7ad3e4c9bb8b971bc20c925e31b2. Chain 2 (Bitcoin): anchored in block 958543 (2026-07-18T11:58:44Z), 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/QZK6L2291844.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbbf5eb721b7864052cd18837159c31d5151eacc0f74079e59cc189f4c996cb9e. 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/QZK6G2263940.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6967a1b0d83c606a3c1a807fe8390e2698055cc8cf55623086a2342dc3ecc36a. Chain 2 (Bitcoin): anchored in block 959080 (2026-07-22T00:07:05Z), 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/QZTAY2297082.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5abf19ec6459e0a42f42ccd99be6e4edde9ace51311f4e08bbedf06fbde827d. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QZTB82205165.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5af79ae052f31a7d968604163f3dfcc57e3f0074f778195697219778fbca1a8b. Chain 2 (Bitcoin): anchored in block 960231 (2026-07-30T08:33:28Z), 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/QZHNB2331086.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41fa23fddaa72054eb9e2c0efa88b6725fca8a5d593cdde00337991ad0654e33. 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/QZHNB2331084.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b81e5ecf6f8ad7ad847b1e54761b024481fd8fd8079f90d69069a6cb75d07fe. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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/QZHNB2331085.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5af79ae052f31a7d968604163f3dfcc57e3f0074f778195697219778fbca1a8b. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/QZHNB2331086.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a59fb38e884341e0aed1fd8855febc566d1c6ed6b593df5ebd0e65cd164c084. 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/QZHNB2331087.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3fb9d6c6c75f090a660a9ff3a993b44088da814d063b64c7706db49d08626dae. 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/QZVEM2329146.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab8e19e2c523cd8e4795578103091983f623f8dddf1731ad6c48179a8cd08a14. 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/TLREW2228983.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84a391cefa09834857bc747e44ee0607e4d8054097c05bdc666aecb976faf636. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/TLREW2205947.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67d24fcb8a4ccd03ce0f59dd1f96f82e7752ba27d7c7ee0d1f9ea3137ba16158. 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/QZHN32120282.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9e9ac2d0a3070e863e6b30227fc4a578c9200da598061393e7cb627853752da. 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/QZTBB2354221.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2448e8342229c9d286c68e54d6e7a938d6bae42e095fbff3ec78947108c0721. 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/QZMEQ2217456.