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 0x08bf26fc281ef017638c3e6dd240d50fb480f8e2ec59e31598c4b224b8323084. 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/d2708cd7-9271-4bb1-9a48-f584c3b9d2f7.json and https://artists.proofprofile.net/proofs/artist/d2708cd7-9271-4bb1-9a48-f584c3b9d2f7.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 0x1ccb8609d19161ea4ed494986a4885170932cf7173b5bd9b08c603c7cb6927c4. Chain 2 (Bitcoin): anchored in block 958489 (2026-07-18T04:13:26Z), 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/NL5UZ2412386.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbccfb61521ddca9e30b9e3a4213b0339ef4a80ca718acec1ad7a521f31c09c92. 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/NL5UZ2412389.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfac32e1e84fa0701b3d63a7bc1f7387a741dd70752a84e84eb707536b718e7a5. Chain 2 (Bitcoin): anchored in block 958576 (2026-07-18T16:22:28Z), 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/NL5UZ2412391.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc67d8def7328054037ac2f831af8d2178c679b07f160fb35d66bd71d60dede08. 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/NL5UZ2412387.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03040712ce20ba914bc319a44c422cc4e9d4b59cc329a4b23894e7c2a4a91f72. Chain 2 (Bitcoin): anchored in block 958163 (2026-07-15T14:38:07Z), 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/NL5UZ2412388.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x815d87d10d28a3f3f8718c1729835edcf3cc78f240e437064a3008d9a22b6eda. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/NL5UZ2412390.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25f5504799e246b4b9e4e939d9518bed2aaab4e413ad790288b3b781eca82b78. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/NL5UZ2412392.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4416b967d167f88a14766d91ad47ddc8047664b3cb37b3fcf14b9f0351e0f464. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/NL5UZ2500650.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c143b86bfce2dac479e4579a81cb37c8734e73ce53ca8c8c75760ffb09f6332. Chain 2 (Bitcoin): anchored in block 958489 (2026-07-18T04:13:26Z), 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/NL5UZ2500651.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b248155cd1264484251930af73e036d6cf31d356a8f40cd96111ac7d2309844. Chain 2 (Bitcoin): anchored in block 959163 (2026-07-22T18:47:29Z), 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/NL5UZ2500653.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7ffef28559a158c7e85bdba18850157814199336578f4b0ba900b3737d7b1b4. Chain 2 (Bitcoin): anchored in block 958335 (2026-07-16T22:37:47Z), 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/NL5UZ2500654.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb1704dcd6d4b6e98d7d27594472fafb308f66a7d5232d64728a0c26650719d7. 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/NL5UZ2500657.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe51ccc362e3b96a87f8209794e1a56e696636d2849f0561af2d5a9ecb0d21167. Chain 2 (Bitcoin): anchored in block 958087 (2026-07-15T02:56:49Z), 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/NL5UZ2500659.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8063f4c098776dd2cdd3cd24b3d49011d0088957607e9a9255cf591e51c3521. Chain 2 (Bitcoin): anchored in block 958596 (2026-07-18T18:42:38Z), 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/NL5UZ2500661.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcaca6332de71d4a6e8907ee935b15cecea465a62039c62bd469a7d19bd0c76ae. Chain 2 (Bitcoin): anchored in block 958384 (2026-07-17T08:27:02Z), 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/NL5UZ2500662.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0aed424d1e105476585a469e0736d5a94f8f95554e3c8b23bb88a4fa5b6b3fd. Chain 2 (Bitcoin): anchored in block 958631 (2026-07-19T00:50:09Z), 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/NL5UZ2500667.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc83416898990f2d02e1f0399f1149c3eb43db276e8beed7d9d10a2ce54f5e38e. Chain 2 (Bitcoin): anchored in block 959152 (2026-07-22T16:23:52Z), 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/NL5UZ2500669.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c0ec965dfde6fc899f32e1077c490b3633537300ad0b805777ebe48095dde18. 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/NL5UZ2500671.