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 0x7948d4ab7febc5b2c1402cf530fd32e4de62d297364ccc7e8b23b640992e5453. Chain 2 (Bitcoin): anchored in block 953616 (2026-06-14T08:58:35Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/1ae3a704-9942-4c20-bad7-706925fec1f3.json and https://artists.proofprofile.net/proofs/artist/1ae3a704-9942-4c20-bad7-706925fec1f3.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 0xbc03845cc493fa1f8f77fe700d85023170c8d9ad4896813c4267cdb9c34b2f77. Chain 2 (Bitcoin): anchored in block 958907 (2026-07-20T16:17:58Z), 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/GBKQU2300232.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16ab57334e7c3a9c0c8fa95baac1e46d0cff776f34b2e4997cf0b6e06e09db36. Chain 2 (Bitcoin): anchored in block 958721 (2026-07-19T11:02:33Z), 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/CA5KR2329215.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3c7f577632d89220a7153a7ed1fd126670609d257870f0f64a5c5b174ab13c0. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QZTRX2329269.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x928c35a7d0d51df15ec84d65cc7122ca6cfbcedbd8f13df1154302a7e52f7783. 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/GBKQU2428788.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85c30558dcdd9263a14533639b011e8231aa6aec83c1574ea2bf3448c40af58a. 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/CA5KR2443562.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1c301cc56cf7a1cac8d3eddc6fcec2178ab8cee852a3bdf1e3ad0dc8ee75c23. Chain 2 (Bitcoin): anchored in block 958371 (2026-07-17T05:45:43Z), 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/GBKQU2437277.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf9cc85a6447f0895fcdfe5007571be39bec13ba2d0613a4c0497889bbda1221. Chain 2 (Bitcoin): anchored in block 958913 (2026-07-20T16:58:47Z), 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/NLCK42418138.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc48cf69982f68047dde5b4f2a295ee06fefd0a3c20339c000fecb3895bc0ed0a. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/NLCK42418140.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcdd13434735204031e1209cc99ade77dff728d42cde74c34c4199d49b856b934. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/GB8KE2503080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96ac1d45ad3903e2c8bcfdf87073a58727fb59513c995ddb24c24d97f761c673. 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/FR2X42510740.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x722bf4af17e0e54a9505e630989bbb5329c31ef5e83b49357d842b6214125ef7. Chain 2 (Bitcoin): anchored in block 958959 (2026-07-21T03:51:22Z), 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/GB8KE2507307.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11219e8235a8a97c1d9f89d6152a78554806d57bb8e056f25b3ba10e49334005. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/GB8KE2507308.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa35672ab0fe32c22eaf575c77d0ae7a16811b1e8f956afe44c23f53c12b8acda. Chain 2 (Bitcoin): anchored in block 959109 (2026-07-22T07:21:40Z), 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/GBWUL2520676.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7c002d67b298e8c727f003fc5946aa38ab5298538dacdf37989f9e21e35f881. 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/GBWUL2520679.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d6a0c4e8f96881c80f6524e9c0b61e2858f6d3f12019ea2274946d9324c6851. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/CA5KR2459172.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18afb4cd896cfe238fadc2bfde238d97b60408ecd4aa4a30f1f7d518732705e1. 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/CA5KR2459173.