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 0x90f0da5d728354c9b1359c70c824d93404a898d3094577265ddd5c3dff29a587. 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/4802f7af-0f02-4046-8b93-d288468b6973.json and https://artists.proofprofile.net/proofs/artist/4802f7af-0f02-4046-8b93-d288468b6973.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 0x0fa36c5f3f771299400fcafbf8be3bce243aece98af7e5ce8ffc60821ed2e326. 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/NL1AP2099629.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93b93d3897273dcf1213c75aeda8391f93665b63951ba161486e709c162cdaf7. 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/NL1AP2099631.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd79fda110e9a013b3b21423acb4ca409e7d69acb1093991d66f5a54b5be969af. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/NL1AP2099632.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9cf25a7809db3844f925b1946e1e946cba70674c2bb40e2a8a360c9993af7c1. Chain 2 (Bitcoin): anchored in block 958447 (2026-07-17T19:47:19Z), 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/NL1AP2099633.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8dc231ec6b8ebe9c4abacd6d80b29f0c80bb95b185a62eca4047f1770b9aad4b. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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/QZES92324632.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32b33a537315213a429320fb9bff2543c32b20d4a771fc589a9491578638ed0c. Chain 2 (Bitcoin): anchored in block 958711 (2026-07-19T09:26:32Z), 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/QZK6K2344561.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc41069a15acd3a74bf3c8c3c3eb4478dd01b2cfff3245bc169e4ad1e0900e5d9. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/QZRP42220402.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda5a1547506d97a139d2079b894debd7b1b8629605188f409d0c2dd641dc3fbe. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/QZNWY2380029.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a4a56aa1cd3beece82c33ffd94694c37e3c98ada63469df36c0e3b704f0adfd. 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/QZFYY2486717.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52d26b24b47d4bb2791f947e46c13b039e7901ce460a91c85dd4e11b3ea0578e. Chain 2 (Bitcoin): anchored in block 958917 (2026-07-20T17:53:56Z), 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/QZDA72467233.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x001956391874b21414bda82a4fe2fd332832dcfd679b304d01f993acffc9221a. Chain 2 (Bitcoin): anchored in block 956738 (2026-07-05T04:47:21Z), 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/QZK6J2491197.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7616150d340c16ebcaa5c1c239fa712805e51f2bd84bcf1d38f30d04d0c77026. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/QZMEP2454518.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x645b5cd6bcdfffb0cbddc7cd03694162eb1504fcd4c2379b8b626366b976dde9. Chain 2 (Bitcoin): anchored in block 958552 (2026-07-18T13:15:29Z), 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/QZTBB2441484.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2003c90f242da15a214ba0da65aa08128ed654813aaed9310e21939f240f11ca. 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/QZZ762474047.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a11943e1108b765b947919fe3a76660481d5097732ffb5c6ba0612a30e6c459. 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/QZZ7K2496678.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68072f7cb8ba36af59bbc97225e21df7fd7c93571e28853b31ae8f5e5975ee9d. Chain 2 (Bitcoin): anchored in block 956402 (2026-07-02T22:05:07Z), 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/QZHN62538152.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd66e7a086a7744aff5ec9cf16df5dab2f50037ebb762ffbff7abc1e823195c14. 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/QZK6H2595289.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd80774505878c46b579fc6a1ccd034533e607a893ba88a0a68181b4845b393db. Chain 2 (Bitcoin): anchored in block 956776 (2026-07-05T10:59:37Z), 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/QZZ7L2515670.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x520966ae328a1c67b81b541f35a33645b2cdac79e6466b1aadfaabbaa3947269. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/QZZ7P2589903.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68072f7cb8ba36af59bbc97225e21df7fd7c93571e28853b31ae8f5e5975ee9d. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/QZHN62538152.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x520966ae328a1c67b81b541f35a33645b2cdac79e6466b1aadfaabbaa3947269. Chain 2 (Bitcoin): anchored in block 958163 (2026-07-15T14:38:07Z), 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/QZZ7P2589903.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x645b5cd6bcdfffb0cbddc7cd03694162eb1504fcd4c2379b8b626366b976dde9. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/QZTBB2441484.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ff51616160f5ff455f81fad3b0a2233029b6a6a5264377352bbe98241eb529c. Chain 2 (Bitcoin): anchored in block 958163 (2026-07-15T14:38:07Z), 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/QZNWZ2507454.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3bb55fbafbb7f2ceea6c63afa12f73c8359d723f1a49b19524f95f75f668962f. Chain 2 (Bitcoin): anchored in block 958163 (2026-07-15T14:38:07Z), 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/QZZ7T2500652.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd80774505878c46b579fc6a1ccd034533e607a893ba88a0a68181b4845b393db. 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/QZZ7L2515670.