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 0x7f03b8e9864372132e2b099d313b8111c666e34e1f6764dedb24981f1df37983. Chain 2 (Bitcoin): anchored in block 953819 (2026-06-15T18:31:52Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/ffa89a32-871a-4222-a5e7-e4290e622668.json and https://artists.proofprofile.net/proofs/artist/ffa89a32-871a-4222-a5e7-e4290e622668.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 0xbf7e56b3cf1d733ecf34a6e8180e519b667e133c3fe6ee1f9404267f33611f42. Chain 2 (Bitcoin): anchored in block 958366 (2026-07-17T04:59:09Z), 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/TCAGQ2222985.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ed88a6a02111b8a5f3c8b18160d12ad9d45b2653a981897ad94f1a53184c1f1. 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/TCAGQ2222986.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda6fac50819c7839f74a3d14a1f57128edbbad5d80279e9a4dfad7f152bf4d2d. Chain 2 (Bitcoin): anchored in block 958517 (2026-07-18T07:54:29Z), 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/TCAGQ2222992.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07ab2497bbb89330cf9adb182f5227e9968d49069f2793c733d1d49490ec1696. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/TCAGQ2222997.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46ba5773d220b7013493dbc1a547d77f1632b85cbe62fa0b7db21b56928a60d5. 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/TCAGQ2223004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x802c2e19d6582f37d56009c2c00dde1817c931386d4bfb25e09f316015da60be. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T13:14:32Z), 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/TCAGQ2223010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x289eeff6938dfcc35f18f93dbab7e50db4b2fb9ebeb36b3579bfc6dc73e0f9c0. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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/TCAGQ2223016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x834466c2b581d56a253f16a8272fb8511a92d300257e10c5522c68db0f66201e. 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/TCAGQ2223018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ecf9ad85b27e4c4df207b5593eea8c9a5ad844d0e002ceb6220153faa575c04. 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/TCAGQ2223024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e01af2280bc4b2f3fe6d2cd28b0b7d0866a422be21770e2f6fff8d30e553857. Chain 2 (Bitcoin): anchored in block 958366 (2026-07-17T04:59:09Z), 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/TCAGQ2223026.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5e3ae12ee2d6ff5b2157aebf4f21fc725af3ef7983c8db56a4594d9e9af4a71. 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/TCAGQ2223028.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7abb19bde19777ad1a0934412f8d78cb2054890b75cc9aa0cffacfba2a62498. 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/TCAGQ2223045.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb063ada1b87910ca05f60c427d5d4d8825d6e03f375bdbb485c9fa7e5bdc768. Chain 2 (Bitcoin): anchored in block 958853 (2026-07-20T09:11:53Z), 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/TCAGQ2223047.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18d9250e1c57b4010f23c4659c63960d8aa9debee8b568a2a8d4402d8db6ec70. Chain 2 (Bitcoin): anchored in block 958627 (2026-07-18T23:33:54Z), 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/TCAGQ2223053.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2aa14b901096b9483d1d4b4e3d8adb3d1e4df19697ad88d7e7bfbaf06da0cef2. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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/TCAGQ2223058.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d069b000fa99a31716a6781b26b5fa40c1decb298204a09a73655277c7a1e78. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/TCAGQ2222743.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18dcc93e06a6c87c3c738f46d83414e381e65344b785e3e5f38c888e6c5b4ed7. Chain 2 (Bitcoin): anchored in block 958720 (2026-07-19T10:53:46Z), 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/TCAGQ2222755.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d3f3bf8c3f359421e32ed0706a848a810b4385cdf71b1b929cabbdffc6a9d02. Chain 2 (Bitcoin): anchored in block 956745 (2026-07-05T05:33:35Z), 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/TCAGQ2222765.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f8b74b89e53621a63fd974f2ea6c6c007a00eae980d90fa212f7765c183112b. Chain 2 (Bitcoin): anchored in block 958621 (2026-07-18T22:59:44Z), 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/TCAGQ2222795.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x639b1f4e6672edd26a09999e6395d8b7bcc371d0d510f816ec40d9c955efac36. 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/TCAGQ2222803.