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 0x42a8aa82fac3acea074c6a06db29b85314037350fa3786bea272eae15275ba35. 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/4d0cfac4-c646-4d32-9958-bf276ffa0cfa.json and https://artists.proofprofile.net/proofs/artist/4d0cfac4-c646-4d32-9958-bf276ffa0cfa.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 0xe37305a5ea46772ce10682dcd3ea8c459decfcbf7739c0bb5f21673d3e4c94b5. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/BCM9B2200489.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c3ccd05dfeb2fa570c5b9d726ca299b4ca6270431ef24835027cca547ac725b. 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/BCM9B2300834.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37783f621c0e1fa5e86ba3b1b5dd4746dfe292538edb4119aff7e3b291e0bce2. 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/BCM9B2301078.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16aa0b303596d28300830dca8b93aa9342d7cc0e8499e1dd75ce78a42c10601b. Chain 2 (Bitcoin): anchored in block 956637 (2026-07-04T10:56:23Z), 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/QZ5AB2454448.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17aa3f344aee44b74385f9e5e1ce88519bcf32d4e9ef33c4fb23f6cd69a55308. Chain 2 (Bitcoin): anchored in block 960459 (2026-07-31T20:22:46Z), 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/BCM9B2400707.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ddd0b2383acc3e46a8feffce892a893440db620440eed444fb28f8088bcc553. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/BCM9B2400866.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d0e13c5bedb667ac72bf761fa7964cd88c0100425df7b23462ab220b6ac6b0e. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/BCM9B2400919.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97c19551fba3c30e949320f4f7ba76ca3dbc591704da8db2bffae7a3e1e37118. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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/QZW9L2490465.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb92802c3c2d8517bcde47ddad55d8af0f45b34883e7d1a9f3d3e855895ed98a. Chain 2 (Bitcoin): anchored in block 958867 (2026-07-20T11:08:30Z), 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/BCB4F2500152.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97c7e3ed7dd532fab3432b7d152f1016e479f3f9cc775e2991a04920604ec902. 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/QZNJW2541529.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1783428a5d8f6e03d2c15740c9d594c5bd97d0e36518240ebfbb2433b8502f58. 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/QZNJW2541530.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd32d4e4ff6d1f5497f094a91a920e38b4dc5a636a8ad8f3c9ea9d1047e89fa8e. Chain 2 (Bitcoin): anchored in block 956476 (2026-07-03T09:04:44Z), 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/QZYFZ2515411.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde616b41ce6bf1152d6783d8a3ed0e27000e1f9719738897d41424aaf752f7e5. 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/QZTPX2437954.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57ad9d8314cdea2e708ef7018f99913ff9e0087a26506920525328771eda8891. 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/QZW9K2488756.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3421f216ccc8b69ec62ed8b4a0749c6024ec7d8fa464fda6f8ed7e575c3637a3. Chain 2 (Bitcoin): anchored in block 960222 (2026-07-30T07:48:45Z), 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/BCM9B2400914.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf6c46f850900d3da4021e33dce91666cc656c39018db0b4574f4b5c0a733795. Chain 2 (Bitcoin): anchored in block 956349 (2026-07-02T11:34:59Z), 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/BC3PG2304017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64925447b61cf81d8e2bcc8c655c90ceb6b483f536ae562c74978db0f333fc1a. 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/QZTPX2308204.