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 0xe0b4cf7290a15b77486d4b69c2764d3a1934e3c926719b4c61004d7a67f717d3. 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/099ce4a9-2285-42fe-ad8a-7b67b599540e.json and https://artists.proofprofile.net/proofs/artist/099ce4a9-2285-42fe-ad8a-7b67b599540e.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 0x3e41cbf914c1c5ebefcb97c868d5fabc4dd3e5679852c7f1d93f76df47da2a61. 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/QZBRF1837101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19d36d3f0f3a665f07fa209732f8235881b0052bf522956af13f1bd0e97e60a9. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/QZCE61884038.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e401497deaeab615c1fd0e4b675b51df190ddc5f31a6e5bf701234eeb827903. Chain 2 (Bitcoin): anchored in block 958907 (2026-07-20T16:17:58Z), 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/QZES91830033.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71dd520ebc98af941920633a94f7252641de3a2d8ed35ba00f803b446d6d403a. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/QZES91830034.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe69c05571f6f429170798e20cf878132054774df06b8dc2d55f7ac72f8868143. Chain 2 (Bitcoin): anchored in block 958650 (2026-07-19T03:36:41Z), 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/QZ4JJ1998660.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe5defa0b3b5da95465a202c578bc1c323be4e5bd97d9dafe990258526ccbada. 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/QZDA81952412.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe21782a4f3221538709cecc8908df4aa42144c4329f706839a0f071a31f04961. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZES71814855.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfcdd45a3fba93f2b8197cc1152ade93752ee2b619b98261c0406761026c1eb9d. 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/QZDA81952413.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ac9af99903f7c9d72dc43376de531b261b60a10815003f0c7b678400f83a981. Chain 2 (Bitcoin): anchored in block 958238 (2026-07-16T04:30:31Z), 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/QZDA81952414.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7733dc20bdec1d53f97d24c2e4f7c14a14720d00d0e83ad258be22ee5e75731a. Chain 2 (Bitcoin): anchored in block 959034 (2026-07-21T16:34:25Z), 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/QZES81835142.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5560066732d0367bf741ea454a250815b6061b291822f3df3968d4901eec261. Chain 2 (Bitcoin): anchored in block 958238 (2026-07-16T04:30:31Z), 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/QZDA81952415.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f1a9d90aaa375e00b38ac21b088649759c04e06fed6de3508a0f282b0b7d9e1. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QZDA81952416.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2aef251c92f53282fe9ecd99813d65151a7c6ea453d4ccc3c2cf36a4ca395dc2. 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/QZDA81952418.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe850faff807b26cf5542fbb80f5acddc1cc55b3fad2770301ec4a81119844b8. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/QZ8LD1985143.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71307ff643464de14a14770f759138f099fd806700387a7480da4c210eeabf86. Chain 2 (Bitcoin): anchored in block 958432 (2026-07-17T15:43:17Z), 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/QZFZ61912900.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b1a255bde5453055b720af68e512b43f4c3538c7e971cba67cac8aa5ef43b8a. 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/QZFZ61912901.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdcf2207d1a772e6f0bd6b1c4ea121c0edba0fe78976947ecd468365a0cbb2401. 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/QZHNC2006350.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x601ab69418c56ededd19be60fcf0566e4fe804134738d201d1dd8446a382e0c1. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/QZTB82205107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x329ff557307c0ff78749ae009b55744f8f77bb361622e499e683dc429c3e2ea2. Chain 2 (Bitcoin): anchored in block 958746 (2026-07-19T15:36:35Z), 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/QZ9452300198.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x336eda485dca46170591d9e47aa87c677d4c40b8c9f77e0be1d6a8af127c17f8. Chain 2 (Bitcoin): anchored in block 958520 (2026-07-18T08:19:09Z), 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/QM24S2403983.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65483d1497d3e5c9712f15895648e24b4bea818efda3f5bbb8ce2239cd66d82f. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/QM24S2403343.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce9939e272eb7d16f83ccba7a10b4db334306edabc88725428e22c68825fc168. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/QM24S2402806.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c970e393d69fae55d41c4f8a25657cbf190f3c364653935d18858aeb207e93a. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/QM24S2403981.