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 0xfef2fab79edfdc53b9fc631c00e1273abe56f53fa34c43bbad44681c74986bf2. 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/99da48a6-12af-4064-be36-2492a8e1853f.json and https://artists.proofprofile.net/proofs/artist/99da48a6-12af-4064-be36-2492a8e1853f.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 0x3904558fde4b5ac918cc9da3433db8e0e5934cc90f5008eec58df96ce88a1cf9. Chain 2 (Bitcoin): anchored in block 958208 (2026-07-15T22:40:25Z), 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/QZXLZ2402864.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf7fdc0a827ab305ca7808b28acdf9b31c3cc6c291027e15a9188a4f0eab7e9e. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/QZXLZ2402865.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x958ee56300b6e5e00f74fb2ed6059e76b55fd7e3cd7963a5f0529d82111ae1bc. 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/QZXLZ2402866.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7cf70e68649a64dd223099c87873b37b75638d0b241da3233f1c0628b07b6097. Chain 2 (Bitcoin): anchored in block 958095 (2026-07-15T04:30:08Z), 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/QZXLZ2402867.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbcb26a3d8d41e5816ea158d44a58fca6a7b826ec2976566638cd3f45ae6edb42. Chain 2 (Bitcoin): anchored in block 958465 (2026-07-18T00:04:42Z), 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/QZXLZ2402868.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98b95c937f6aa374a8687c8cbf2334588b8a0e92ebbd74b3470a8b6370e79146. 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/QZXLZ2402869.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1a3f182271606230e7ac7fdb4e05370d4471b863deac600e0b7d93d60d02062. Chain 2 (Bitcoin): anchored in block 958152 (2026-07-15T12:00:27Z), 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/QZES82517240.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa280124c49aaea910098f29103967871d22f29e8d3b70f54bf420926ca5cd541. 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/QZHN42564872.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2f8a07f05ba041001f8b29745931731ef6103d2b5d9b66a1149b9f9bd4b6af4. Chain 2 (Bitcoin): anchored in block 958238 (2026-07-16T04:30:31Z), 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/QZHN42566505.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03a253cbdc8b1aa36f4bfcb30c1b1ee834919ea39467aa5c217ea6e032b064f0. Chain 2 (Bitcoin): anchored in block 958185 (2026-07-15T18:19:04Z), 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/QZHN42568711.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40027346139c5485defc69614b32cd58facc5a51aa3ae9f574fe512890d34d11. 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/QZHN42568712.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd1e630c12aaa64838bf26a1eb2553fbc637707f3cad9dd04a854f641d26a9f9. 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/QZHN42568715.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa684f06fd415b733f3e0183f5d3c72ae6ad08ded4a37a59fa227cdb774dcbfa5. Chain 2 (Bitcoin): anchored in block 958091 (2026-07-15T03:17:03Z), 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/QZHN42568719.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1117c11d9f90ee9f96daf50e178b52d4af53d345cf45e95883df0f5f9724a90c. Chain 2 (Bitcoin): anchored in block 958180 (2026-07-15T17:59:52Z), 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/QZHNA2589900.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d3fae0b48834b4518a22d2048ce90df6d095fd94da8edfdb6a7ac2486aa69f2. Chain 2 (Bitcoin): anchored in block 958180 (2026-07-15T17:59:52Z), 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/QZHNA2569164.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8cb22ab829eeb4e5804c7ad5fafd39f61611347a62f08bf9a5df7e5af3b57ad2. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/QZHNA2570237.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44a9221f150dbb0041b30b236735b2bdbda206bbb8b7056f37ff5c26de3b42d9. Chain 2 (Bitcoin): anchored in block 958180 (2026-07-15T17:59:52Z), 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/QZHNA2569228.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2aa0c86ff695ed6231d3d13a1cb3852554a7a94b7cb7c850851a462627b8bd23. Chain 2 (Bitcoin): anchored in block 958095 (2026-07-15T04:30:08Z), 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/QZHNA2570259.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf784f92a8162d197e210f4eed4b23e8ef7a40f02054c9819d5e46ed05883e720. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T15:55:19Z), 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/QZHNA2570264.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa617eb75a45197c271f9f9e24dcc85cfc40db7dee7b5adcb90df6924168d1466. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/QZHNA2570266.