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 0x610f8887dc8aac1e34ab016039d7a210859070572f2fa9a7749d754697b04883. 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/738bec90-6bb7-4996-b7a1-6325900c5dff.json and https://artists.proofprofile.net/proofs/artist/738bec90-6bb7-4996-b7a1-6325900c5dff.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 0x53f8f87a3f9520ab9f016eae8b64b6419cc34770f04e47d2d1b3ab6a4c64db41. 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/DEEG31200001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0aa1bfd8a759554d9ee6897095d0dff95de7827c9947a71f5bb77daaa6079bc6. Chain 2 (Bitcoin): anchored in block 958700 (2026-07-19T08:09:50Z), 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/CH6131592001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4fe61262e1b1180900b707e4797d6c427b12e2bc923b19132444a5ddebae397b. Chain 2 (Bitcoin): anchored in block 958682 (2026-07-19T06:17:12Z), 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/CH6131592004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4e10188e5a45259666ab5228df2d3329c99a7f8c8e235290eb3fc89aefa73c0. 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/CH6131772501.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3baef2354b17a99f79e0623556d1a6a4e368a7ba5ea4171d4d442f734608925e. Chain 2 (Bitcoin): anchored in block 959096 (2026-07-22T03:48:36Z), 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/CH6542280501.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe15c770387b429da0ca6e8b63254f127c8361aa45ccb0534042557371927fda3. 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/GX8LE2339512.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb58826fe935229c45fccd311c1c3b25ab6125a20d9d680c270968a2bca40a4c. Chain 2 (Bitcoin): anchored in block 958060 (2026-07-14T20:39:42Z), 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/GX8LE2328672.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44c0349b2791ccd562c8b1cd24991ac3a4c910c2b96cf93aac960550b0f7c962. Chain 2 (Bitcoin): anchored in block 958395 (2026-07-17T10:10:33Z), 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/GXBDS2451380.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba9f037b3a24939cba7614fb2408eb820bb6993efb33df40016d837d7c734485. Chain 2 (Bitcoin): anchored in block 957653 (2026-07-12T04:35:02Z), 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/GXBDS2489915.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45838c10e28979167c2f41bb307a37543b9c975f66f3881f8d141a28d69737c2. Chain 2 (Bitcoin): anchored in block 958792 (2026-07-19T22:55:52Z), 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/GXBDS2447864.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9dd237dad159911a7f7496c241c9faddaeb4bb65d1adbe51c60e1635d7a28057. Chain 2 (Bitcoin): anchored in block 959084 (2026-07-22T00:50:00Z), 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/GXBDS2465315.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ba85bbd75a53c4977691710fdde5f5b520d2947c3d1ad98357d412b047b6b9d. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/GXBDS2461635.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x313e2c7960ac44c7c3420badea08e62cdc9f498a3385d4796be9348264f70877. 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/GXBDS2492782.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe499db90794d69b898c6971330eed1fb8f56ff03a833203166e746e9fb64a0b2. 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/GXBDS2456107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e13fc71acecc5881b3fd42040f5bc5c01b760283382536fef66771054e5c3bf. 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/GXBDS2454311.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb553c2d63df2752588167478cbb91957974d182e7baaf2bc3b381409235fb617. Chain 2 (Bitcoin): anchored in block 958063 (2026-07-14T21:07:34Z), 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/GXBDS2473646.