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 0xf7bcd28883ba9b185726cfb94f47901938e8eb66a83fddaeca3afa155ca6b590. 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/66f0ebf2-e098-4ae0-8926-6edadaa792a6.json and https://artists.proofprofile.net/proofs/artist/66f0ebf2-e098-4ae0-8926-6edadaa792a6.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 0x1689c4c25efcde9fd1de1365d265189435bf879297aad9a8a6fc0a6e270c9259. Chain 2 (Bitcoin): anchored in block 958742 (2026-07-19T14:09:34Z), 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/QZHN61920582.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa79b520b0d861e1369090fef16fdee04810f4fdafe43a06c8b1add19de7e3595. Chain 2 (Bitcoin): anchored in block 959008 (2026-07-21T13:14:05Z), 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/QZMEM2034764.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7c631bb8eed092859a06b889e10d68d7de69819d89d010974bc96f0c641c23c. Chain 2 (Bitcoin): anchored in block 958436 (2026-07-17T16:42:22Z), 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/QZNWY2180443.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ce03dd4558886b7a69ea194f63e002b85ed9861446151e2b03c5f123241219e. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/QZK6K2213451.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20208db04d69a16ee9a7eca2c6740355ee0607c0c8be4a2e6977b3262739f3df. 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/QZMEM2240851.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d6d2cf6d771c813490ad29a60ab64a959ba06ad22a97abfff3de07ad053ab45. Chain 2 (Bitcoin): anchored in block 958650 (2026-07-19T03:36:41Z), 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/QZMEM2240857.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49b2b5a26f921c6e0104212267e66d5d9b25788fab0eac04c19508a6fb19ebf7. Chain 2 (Bitcoin): anchored in block 959008 (2026-07-21T13:14:05Z), 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/QZHN92396363.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa923542878c8e470e138094f1ce643659c5eef3c29926979cf798ccf8c354ced. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZHNB2366959.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2c9b83ccc089498ef71c2d5151574080dd441e41b2b806f9ff592688bbd1d0a. Chain 2 (Bitcoin): anchored in block 957851 (2026-07-13T11:26:33Z), 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/QZRP42326162.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16de3c46c9b4c59a0d6fd18550de758a93f6e86994f7a40a92adaabc30e52443. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T02:01:41Z), 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/QZTB82328615.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x156234101f7285a1bc27bf1cd179e8e47137c826395e4882a46ce63592c15614. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZDA62434300.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c225a8a30c7b4e09d515543b602b6e609ed5208f3618dfb20923f608f1cea0a. 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/QZES82472187.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3013b8f9a14f90367dea1ed5f5d5a4fc67af7779493be60084b8630daa2ca14f. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/QZNWS2452630.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c13835bf352be0dda8e6fba40638e99f723a3dd045b0212e63bcfc69bfc58d5. Chain 2 (Bitcoin): anchored in block 958535 (2026-07-18T09:42:49Z), 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/QZNWU2456963.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51662c5f81d4787fc2beea2861d169a19a65e425d5b6fc88851d51ba77e96593. 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/QZTAT2499279.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7acc5d33cea0807133ec6614caaa1d9a3677c70f0f9e9709a05313315c543a5d. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZTB82469034.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c41cef8d01aacf9aed368f0737ec8bedea13c5a7c76f59f46adad8be4697b74. 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/QZTBF2423053.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xadd3e859cbb62880f33e6aecb18fca554a814f877be539933e71525755f11b46. 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/QZTBF2465673.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f6283eaa34cf6ae38c023407f6c56af338919f9af8094b106db824da5886c35. 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/QZZ7M2468374.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c00db7a42692d87b75c2d5e23d3e7eea6dc8dc87941d9c52e60e56375836a4a. Chain 2 (Bitcoin): anchored in block 958140 (2026-07-15T10:05:23Z), 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/QZZ7W2400134.