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 0x73b040f6fbec59f3134f864013745a0650e5afd3fa9f60a19469eb2816d8d24d. 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/d0f93a7a-64bc-40af-9334-bd310d1bfda3.json and https://artists.proofprofile.net/proofs/artist/d0f93a7a-64bc-40af-9334-bd310d1bfda3.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 0xb2d02117fcb161aa3fb2d9be4a80cae779aed52e0dc80c476273c8141a669ec0. Chain 2 (Bitcoin): anchored in block 960163 (2026-07-29T23:20:38Z), 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/US7VG2336611.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3927d071cd0acd4ad870eb32c18ecb4af6a0d26ba9d6535ae5260303de66b59. 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/US7VG2317122.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x173691ced648f878eceb95dffb8dab1c6239ed0290e7133d2c8f654794593412. Chain 2 (Bitcoin): anchored in block 957774 (2026-07-12T23:51:20Z), 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/QZMZ92595615.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51a4dde58975a966e157a388fe358d18f74a21babb030a7fa2315acd05c2564c. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QZGLS1993698.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a92a97834141f3c96bc0fb40277c1281553411c4bd5ae3f5d2eb4478d385aa4. 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/QZGLS1993699.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff82a76aa92d2b686e450f4ac333f4b184df46e044d9ff35b1b6d9c761a49e52. 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/QZGLS1993700.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa45db30c1f103aac015d662d534dd1102d85f669e34674df58f9ef62be045b25. 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/QZGLS1993701.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3d6163c27ee56122eac187238abdf893f97a29077931fb89026c16f15c149ea. 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/QZGLS1993702.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa9ce759a9907410253bacd66117afb45614cacefa6129799fcd6f2707512630. 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/QZGLS1993703.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46568134609a28b1aa39055a43adc44bd64d720cc0140d40d3d35188b507854e. 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/QZGLS1993704.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x887851cb21ea5c0786b99a32b6f7a1c890402a079583814c379faa6d49ae99a8. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QZGLS1993705.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27dff7b4b8e0e2b4a402f2c4cdc022f2bd882a80b0fd7de0e1b04fd6e8ed179d. 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/QZGLS1993706.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcef8048874df8f554c51aea868e8aef5cc4be65b9f3285c8e0dc1ad9c35af8df. Chain 2 (Bitcoin): anchored in block 960317 (2026-07-30T21:35:24Z), 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/QZGLS1993707.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x224b85f9f2d8bfe49d27b4cd34f768e6cad99cf16bc4a48f600257e85ea094de. Chain 2 (Bitcoin): anchored in block 960309 (2026-07-30T20:35:49Z), 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/QZGLS1993708.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29220c4751c2c9409d883dd02b249dda12b5427eb4b4c6981d8d23911a37f6e9. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/ARIXB2402210.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0fcd8f741a2b0cd8dbd8d8516e32b9aa608a25e3ef94d3e95565b472d58b7e64. 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/QZ5AB2411569.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x787ebab6d3679b27eb4259d616a47d2c96d81cdc9cde6c5295f13f07f72de064. 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/QZTPX2312246.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe876759c0e01ba7dc3e3d0d49910e1a9c4d88a935544ce1b5a3f4f62f32ee87b. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QZNJY2166551.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16a01d2a56655fa1ef14c34bbdfb7c3737a481ed430c5cdd82443160e49adef6. 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/QZGLS2005734.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e425a504e80894e0a8f9ed5f4cae2412f862789ae0ada8bc50d54ad4206410f. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QZHZ31930827.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0751a344726226eaf52606403739932a988b0551790ab98ca8f9c1d75fb6301. 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/QZHZ31930806.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa44bd488840071687947c06b3d78f61c2b6d24d037b6b5d8b0fc014daa1985ca. Chain 2 (Bitcoin): anchored in block 960121 (2026-07-29T15:22:21Z), 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/QZGLS1996649.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc95d2f26b779412b0dcfa3c726ed4e36dc38c9efde9d8e1ede2898f995be881. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QZGLM1901755.