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 0x265f3eb342a52de550def51fcf90fcb6a32b26a50f79251308b340f0e3761f93. Chain 2 (Bitcoin): anchored in block 954784 (2026-06-22T02:53:59Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/ea9c7478-9548-4e75-b909-a9edecee1b27.json and https://artists.proofprofile.net/proofs/artist/ea9c7478-9548-4e75-b909-a9edecee1b27.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 0x62a4086adb45b71b99ad2106ede8da3593c778d2bc780a47ce332c4de5bbd982. 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/BXA8C2200002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d9585b1ef43dae80f44585d267c09dd78bb69abc728a689300af48cbea92ff9. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/BXA8C2200001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3d7d0f618984eec031f21597b48308494e395eb3bcf196a64ef0a7d1ec6573e. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/BXA8C2200004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc42c4eee4796194f97f08bb7dcfb593f6dff1f902d9b2ec33f592853043ce204. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/BXA8C2200007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b81ca6f69b598f2bbf67701594a65fe2d5335d0237cd3d05eb7443d279c7818. Chain 2 (Bitcoin): anchored in block 960463 (2026-07-31T20:42:35Z), 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/BXA8C2200003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5308bbd8526bd345c230372e2d8af0724c2bc0951bafa09020db7e83acd05e18. Chain 2 (Bitcoin): anchored in block 960404 (2026-07-31T13:06:57Z), 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/BXA8C2200005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ec701b6fe47380e299a2dc1a0ad07a03a022bca8ab8b9495ff556541d9c2d62. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/BXA8C2200008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5e582833d362e05339e4477335120414101d794f17260639adc1d1d916f0fec. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/BXA8C1900001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb575dedd9aabcc1662115c831795cbf432ac975b6ed9132fc3b555b800431a13. Chain 2 (Bitcoin): anchored in block 960317 (2026-07-30T21:35:24Z), 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/BXA8C1900002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c810256ec1df7c95654fddf6c27d03f045fc5f48d8541f9ec707a77f517b263. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/BXA8C1900003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30f1f6b18f908cfc92424212fd309198a959d8695290fbcacdcaa8b9809f0588. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/BXA8C1900004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb47ad6dbe8a800f52a644ca13abaa01332a61242dcd8648e962ad6739df5082b. 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/BXA8C1900005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9495134fc1820ef696d7ea956a1211a09413d652868c74c9cec3a22c9da97615. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/BXA8C1900006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae75550ff96bc74ab9cea35c1cf9eb2f1fd85dbe011ef94ef6395aab074cfd11. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/BXA8C1900007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7166ba4bd2569498787eb6f1ae527e10fd95a76d73bb59f3ea6ceff3ed19e04. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/BXA8C1900008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51be0205fb303638cd84c0ae7bc20d8c0bf287f9be61333d64028d3b0f104975. 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/BXA8C1600001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe3e42cb6ddc72ec3679e26ac557d49f13140e8ff0356cb778697294044ea032. Chain 2 (Bitcoin): anchored in block 956894 (2026-07-06T07:53:57Z), 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/BXA8C1600002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9be6235fc6ed2fc566b3c89d1870906504cd8860646cfa1ba6e663636c6fde66. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/BXA8C1500001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6893d161180d71c34e7e0391096cf1caaf3fc3c05424b738a959c4ea462284c6. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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/BXA8C1600003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c291569ed5f20b98076930f78e9aab04bbeecfda4f66e13436e66e5fcd82571. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/BXA8C1600004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd20e91525754f2d87e36ea623e236bcef3a7c8fb6119ec9830b3c6c367b35467. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/BXA8C1600005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x750c3dd9fac3884dfe56441050ac0df9aaa47e3c6d6ed00d4fb5bd2d388e3efc. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/BXA8C1600006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9fa65e771b284c3a8f0c9306fbfb7e85ade5dcfbc9d1b965bfc1b487ad567211. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/BXA8C1600007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x914301303dc635eead4ac7c04358f3365c1718b8af029cf52a74831234ccdcea. Chain 2 (Bitcoin): anchored in block 960220 (2026-07-30T07:28:30Z), 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/BXA8C1600008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xffeb976aa724ca8d2c4ec3005cce5244c7bd6f08adddc565c58a9ac32f22790b. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/BXA8C1700007.