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 0x1cf7ad0f3a10c19c989059b072038e461fb04a61190446f19f353f1a55a7926c. 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/b9c5c8bc-5ce7-4f5e-8e1b-ed32ca501f5f.json and https://artists.proofprofile.net/proofs/artist/b9c5c8bc-5ce7-4f5e-8e1b-ed32ca501f5f.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 0x355001ef5f8d8a0557ab2ba6255447f0acfa87b2a9e311c41297c75ddf7bfdf0. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QM6MZ2230983.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21231c88efd66cc4ff475d375735a7a4de51f158e626da0ed5a533f68b4bb7be. 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/QM4TX2331266.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c8b2390d96f79af425b9c742a0750a69fa64ea4529d8e51ae66ef4ae8449cca. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/USDXS2202700.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb87cf103dd381bcc3080d969b409ce5b505b82798a6fa5768ad0e0f16ff6a585. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/QM6N22093911.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26efd939713c45f9520216c4a4c5202c3b30493e4bad1b7e1e640cb4c3e0b1bc. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/QMFMF2323404.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf9ea0858603a22bc6a9173178f4a40da1514d5060892fff20c297e2c1120c55. 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/USDXS2302180.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb682fd4df323ebf3b0281011f38628f1235c80cb93aad72bb7a3873a48138226. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QM6MZ2391084.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98cf0eab912c53613c14f23a8fbd810a1f7919789363eb8bfa8f07b2e65e4005. 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/QMBZ92092371.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6669d57308b1a68133d0e48c63fcddf22b06a2210be56a21bd69548588939576. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/QM6N21966736.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6581502199fb5d9abebba11e7349ae071b63a2e57ca12f29f4dfe64e078fd705. 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/QM6P41834536.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5d59d2f00beab3ae079ea9b6e91590391ef2fd98bd5455a188d9d953c93cb2c. 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/QM6MZ1872172.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba939c1eb6f6347264fb63fa36f26433518669447b0597657476cf03ee8be9d6. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/QM6N22471487.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75953bbafcea0c24d88a1d4e66b3c4776e72ed2963a6652d086d3ec840b11d69. 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/QZMBZ2100041.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00345b5620aab211a9c0069d312d19c39d8427723912d3a91b86024fc30da70d. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/QM7281941823.