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 0x196a2765d966bf3332fddd87fbee83d7b5ad46c480c01ad7252592123d1fe6c3. Chain 2 (Bitcoin): anchored in block 953997 (2026-06-16T20:07:57Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/288e44ce-3e2a-4a07-99d4-cd2856ffacf3.json and https://artists.proofprofile.net/proofs/artist/288e44ce-3e2a-4a07-99d4-cd2856ffacf3.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 0x5d1697e014b4d8c454254fc666e1f74dfbcfdfec8e2131745ff7d319245b7253. 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/QZK6P2474441.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x458d86511635799795bc2cb1ebca4f6c041e9bea4777da76acc5fabf2c5d777b. 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/QZK6P2478015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b19b8a33bf73f2059d5d05239eea5da84311b0655718f798d8a9ea9c649d905. 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/QZNWY2489019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x430f79cfc398bdccf4411145b8dd0c7f6c14f02923ce52fc5aac03d2787b1d7b. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/QZNWY2489020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb19634415a16973b2b876b56adabfec08f4531975e37d1a3a795fa8512ed266a. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QZNWY2489021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2daef874a8c960854671c6dfa0348371c41d6d8ee97ea21423bf832f630a8680. Chain 2 (Bitcoin): anchored in block 960489 (2026-08-01T00:40:43Z), 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/QZNWY2489022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c9b3b705654c3e3c0ec7d850f694a151b8323afa47d8938809827254616bee9. 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/QZNWY2489023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29aa736686f966b3fc05d3dfb5b9c803f3d272276d5e6cfee943ead795ebc7fa. Chain 2 (Bitcoin): anchored in block 960354 (2026-07-31T05:48:18Z), 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/QZNWY2489025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc03b9d43a94a4ad7dd0d7f46a320e30054b2d38af3421986aeb2cc7af8de3e44. 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/QZNWY2489027.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4bcc8dbccea59402eb13d0821bbe78a499eed11d20081317b17eedafd0b1c8ba. 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/QZNWY2489028.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab90596052a526182f6479b75703e3a957748776c46a69b597081e4332b302c6. 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/QZNWY2489029.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2de248c7fd459551c16f413f7198dd4b6c28d9a51acf1b330f87deab89448e02. 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/QZWFM2461855.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13cd5eb974284a1241ac0341ad53734d6e814b74158ab134f505c8f8198a588a. Chain 2 (Bitcoin): anchored in block 960513 (2026-08-01T04:52:22Z), 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/QT3F32455718.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8177857fa955492092ff6175e44a3e1c8f8558f80817b393abb3b69a38f1e8f. 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/QT3F32455719.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x609dca655d87f7252b5185c00ce137f717d78cbd67e60cfa2f9cf8cc816f939b. 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/QT3F32455720.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x379f5a16d53d642ced136045e4fc5913cf437deb5048494e7e04309d7b2be4ff. 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/QT3F32455722.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67d26c95b225d5eb38304cc89f9cf3bbc5449f9f366f762e9df4f47b86163355. Chain 2 (Bitcoin): anchored in block 960209 (2026-07-30T05:15:54Z), 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/QT3F32455723.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0a670a63993398f31a0e6ff45cef46e77ef37bc15310538eeb1dc53217ab86a. 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/QT3F32455724.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b45262539573657d27161102a457253c4ad2143338d7d97cdc3227afd56c469. 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/QT3F32455725.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66a5573bc2da27c9575c6caf45bf7b4da8e0ca4839e85660e059c0f13ff56a34. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/QT3F32455726.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x193b636761d8665038154b0de0d41684e771bed61ea10d7a91c95d80110fb356. Chain 2 (Bitcoin): anchored in block 960288 (2026-07-30T17:41:38Z), 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/QT3F32455727.