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 0xcfb4abbcae0d0142cb2ae02025681017cb4600155b06ca582b6a2af5dcef1979. 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/7e48481b-ca13-4fff-bf78-effa62ed979c.json and https://artists.proofprofile.net/proofs/artist/7e48481b-ca13-4fff-bf78-effa62ed979c.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 0x6d07402e226912722b597a37bfdf1eb3bb9f44a4d9b4597e2ffab3298f888eee. 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/QZWFH2354041.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b6510bcae0449ed5c958b4b33abf149370094acac93cb35111c0c7344cb70aa. 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/QZK6F2489449.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c99d33df8960dc10b10d706a2ff6f9f6a85e13ba1e88f1f7cd2c52e9165637a. Chain 2 (Bitcoin): anchored in block 958140 (2026-07-15T10:05:23Z), 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/ESA012462385.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb492f3ddbeef639868ae52b920c5969bc8752b373be278372b047c5d331a8c6. Chain 2 (Bitcoin): anchored in block 957851 (2026-07-13T11:26:33Z), 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/QZES62540920.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11b1e28381111ed8297bcf36a5d2bd9626ed0990452a36fd78f33918c3ae2db9. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/QZHN32545131.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b5bf617d7dabcbdbe28419c4f0558ca38b61217ba3783e9856001fe9681c298. 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/QZHN32545137.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91a3f091db2089e7fa1814adced8e1b8c12f6768d7d602b7dafae9be390f5ab1. 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/QZMEM2572556.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x590e78999c70a7695ac01d5e7621839a9ac883a2cce655c20533db16725744fa. 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/SE57V2413464.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11f50780039628812f341c2bdf3313602aa845fe6f942557a3bdad57f380fdf2. Chain 2 (Bitcoin): anchored in block 958832 (2026-07-20T05:43:55Z), 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/SE57V2413465.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22ffe7c909e4f12f1a48db6a0aeaf26f193bf78955df55ec9da95913bff2dd9e. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), 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/QZNWX2580350.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79a57aa3a582aad4c5083cad6863bd9c6696c076bb89a39d3e195ebef2980a5c. 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/QZNWX2580351.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8d09e2a78ba88a55e27daad2792576a18458f8d1cd163b124f4180d56f4d027. 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/QZTAT2593964.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ffdb0c0dc31681f76604f0d6c4d52e83aecbcbe33adb2d374f51602bc9eef05. Chain 2 (Bitcoin): anchored in block 958185 (2026-07-15T18:19:04Z), 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/QZTAT2593965.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f27a5c47355e6d3f50793bbe7c9ccbc627962edcdc0f19076683d0944755ef0. Chain 2 (Bitcoin): anchored in block 957780 (2026-07-13T00:36:44Z), 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/QZTAU2548519.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50614be9acd2734efe03657340363f22e1b15b22be391474297380a77935ca9c. Chain 2 (Bitcoin): anchored in block 958378 (2026-07-17T06:45:39Z), 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/QZTAW2508400.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4fef5f23ac66a135e42a3b1c99f63c9faae7b9b4aa4e5a376c2afdcfaad76e94. 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/QZTB32594385.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x346fed568f989d9be096e72624baf61d1efb97af97fa6bf8648c069a4614812a. Chain 2 (Bitcoin): anchored in block 958905 (2026-07-20T16:14:34Z), 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/QZTB32594387.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96a49c8351da90a2865bafc794313fb06e2e0397d13143b65e3e7d05b2d89ac5. Chain 2 (Bitcoin): anchored in block 956861 (2026-07-06T01:57:57Z), 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/QZTB32594388.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c2fab0180433e1d9d8ae494d4f93c55a4d695910f6a16cb959eeaa891ee7947. Chain 2 (Bitcoin): anchored in block 958538 (2026-07-18T10:30:13Z), 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/QZWFH2547101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6dde773b364f0e96e6b7bf6cfebe2acf94783859f8e893f8f01a9aea56aea495. Chain 2 (Bitcoin): anchored in block 958771 (2026-07-19T19:27:18Z), 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/QZWFH2547102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0b8f40e2ceac864192d21508b7479c5a6d7ca373ea793ad9316c4a1f840c5c7. 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/QZWFH2547103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41643bbbc7d8ddc3ab0bd0c9f3d158fbb39f64933f12d6bc81a2492d5b6851cb. 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/SE57V2507221.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc63a8db518d19951d4cfc2d14946b13b6304b2be0bb30cf31cca01860f049c2. 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/QT3F62500073.