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 0x2450b1fa110153207a8b98d21b6997245a5f094f10401820d881a3a2c00331f2. 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/fe832a80-d806-47e1-88e3-77529e10493d.json and https://artists.proofprofile.net/proofs/artist/fe832a80-d806-47e1-88e3-77529e10493d.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 0xca48970974d624cbea6f55e732ba6380529ee52241c770c737a0e58547107df4. Chain 2 (Bitcoin): anchored in block 958680 (2026-07-19T06:04:14Z), 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/TCAAW1108041.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8d22fdc18fd46ec4cbfa7ac1beb37ef56fad25d65204d3b3fc2ffce14650d09. Chain 2 (Bitcoin): anchored in block 959031 (2026-07-21T16:15:11Z), 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/TCABM1311360.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd70ff750518474cb14f080fb723cf46d696d17ae446ee90d24a48f8c52663f1. 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/CA40K1600001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75179e4aea54724958f58f150c38d6a78de47871547d85c1bf638036737f71f0. 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/CA40K1600003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa98ede89f13f0b96c8a6b1343192badc35e4b54c2e504a1f276501e60c67975c. 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/CA40K1600006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b09473ce60857c33ea1ed4845e59ca59cff5f21d71a34c9d7adf64f6fbd2b87. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/TCAEA1970152.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83a71d4e9c352409e8d098ea5c289bcce4e9a79fda7a677919ee824583f775f6. Chain 2 (Bitcoin): anchored in block 958058 (2026-07-14T20:20:34Z), 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/TCAEA1970158.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99eb3b13104c1034abea36db6be38054b602f4fea99042449ec2b2ec24315e05. 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/TCAEA1970163.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65909d99e93b7ca71f7ae497f86d70e24b78a1a8df8082c87b559aa70dc3bfb4. Chain 2 (Bitcoin): anchored in block 958662 (2026-07-19T04:43:15Z), 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/TCAEA1970166.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61a53602db88db0694dea815cc2095c526f3e771a80a8841fa1257de6527282c. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/TCAEA1970169.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49e2d3dc6d719e408881d3f35e31b8bafb932d8d85bb6d4b8233968c41733184. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/TCAFJ2187356.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6779bbbde449ef9463e1392e8e76f244183c6cdd0ab775dd525d070409d5a39f. 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/NL8RL2504789.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x838c3ce7980cdc9c65626b296471b8f9525b1bf7a44ae1185204c0d0d1e44715. 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/NL8RL2504788.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6779bbbde449ef9463e1392e8e76f244183c6cdd0ab775dd525d070409d5a39f. 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/NL8RL2504789.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4968aaeab061a9e24025c890d6ad20b88cb541a0cbcdcdb765faad8e169282fd. 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/NL8RL2504790.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaeaec927f0514b26d33f93deedf7d298ecc339ab4655559fee82075005909373. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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/NL8RL2504791.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3db2679405135b0b0db06eeddd1b3ec3e50d0593aa64470f8874daff9602801d. Chain 2 (Bitcoin): anchored in block 958514 (2026-07-18T06:54:37Z), 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/NL8RL2504792.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x375ae5dabe235593ba789624c35dba15f5bd7e4eb717f6ee706e2cc93b9ef464. Chain 2 (Bitcoin): anchored in block 958465 (2026-07-18T00:04:42Z), 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/NL8RL2504793.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82f5f21383f1666d1be45d33f3bafaa6b632e8dfc6f77ef11eb99bb1d84536cf. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/NL8RL2504794.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae5316b3fc786d73066922de93ea3d81d7d9de53e17e0c53562e4ca12a87e85c. Chain 2 (Bitcoin): anchored in block 958517 (2026-07-18T07:54:29Z), 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/NL8RL2504795.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a59623c42b168193cbbe6a2e6c6f6905037f1ffe153201fddc0b2cb6143373f. Chain 2 (Bitcoin): anchored in block 959132 (2026-07-22T13:20:46Z), 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/NL8RL2504797.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84db7409d6ec337d486eab1b7caed463a21826ac28acca61886cb06f0519b965. 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/NL8RL2504798.