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 0x1efec1fc94492e3a8d06cd498e20130bce629911c0abd5f557b7a3fb8e6ec476. 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/a73661f7-8743-49fe-b2eb-6a6b28608d5b.json and https://artists.proofprofile.net/proofs/artist/a73661f7-8743-49fe-b2eb-6a6b28608d5b.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 0x74e1d2e884d330fec46df893552f165c946763961059c53ef2dbff0428eb1a4b. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T10:20:17Z), 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/QMBZ92432180.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x747a0aa3d304335b72bc6d538ba7f64663eb68130b0277ef2339417d38fc9527. Chain 2 (Bitcoin): anchored in block 958176 (2026-07-15T17:14:36Z), 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/QMBZ92432206.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee752f18bd7cbcebaa2d90b310648035e962a8941f9a43f7b8a5c45e059a1c85. Chain 2 (Bitcoin): anchored in block 959073 (2026-07-21T23:25:37Z), 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/QMBZ92488639.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5adb2a07a55e366792cd08579ff6a94353b3aa4cad02752228bd945f3aea6fb. Chain 2 (Bitcoin): anchored in block 959076 (2026-07-21T23:41:40Z), 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/QMBZ92488688.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d53046f49435e842693b36a25e36092598bd56ac527603218354077d76a0ac2. 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/QMDA62410998.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e58ed61bd21b573a470a49a58f2a296aaf78430e959be78916116f1162ae2c3. 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/QMDA62430051.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4081da2d472657f3df972a2faf0b06262229fa9a3489396145ae80f65413ccaf. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QMDA72473967.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab3cc6d0246203caea75d0ce073d68d302a27ad60393a7456479dfb3c8dce14f. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T10:20:17Z), 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/QMFME2446294.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05cf9747b546d16f143ddad1c0661e1c4373c078ffc694df48069bc92686cecc. Chain 2 (Bitcoin): anchored in block 958363 (2026-07-17T04:34:46Z), 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/QMFMF2437317.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2294f6761b975fb689246297092b9e57750daceeaf52f1565fbfdca445abbc34. 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/QM4TW2502270.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x400f506ff58217ffd5d803684520a70b2b9eed1267a53a10c98e3476100c8073. Chain 2 (Bitcoin): anchored in block 958864 (2026-07-20T10:24:04Z), 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/QM4TW2540364.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3b8017dce556edfc6e24dacb9d453b59b164866fd204232571b901205c2aa1d. Chain 2 (Bitcoin): anchored in block 958980 (2026-07-21T07:04:12Z), 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/QM4TW2546789.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc9ded8963c3b560df30f4305a4e1aa2456358da82489c2e2c1a6c1e67f2dae9. Chain 2 (Bitcoin): anchored in block 959138 (2026-07-22T14:10:55Z), 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/QM4TX2508296.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5701b3efb5dcc217f0955f445e813fe39e931ff1e1f77810635b92a6f447c045. 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/QM4TX2565836.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13c9c6e56aa83951ce109c012c7d35911b723d8e05fd83f7c2938b4a7d477fa8. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T10:20:17Z), 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/QM6N22535373.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7a4c3df8b06a68f3db3738db814be8ce94405beff675358547d9b57d78d9f15. Chain 2 (Bitcoin): anchored in block 958617 (2026-07-18T22:07:13Z), 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/QM6N22538199.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b346fa45b6201616e4cdfb610541d7b1dd72755a14c39f2fc3b2ea3251bbbd9. 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/QM6P42531525.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xddf42771d0d4f7eb6ecc4bdfd9f8190958f43d0a5d35aa2e03b8c0e64e0cf6ec. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/QM6P42570394.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x052c35da0ad2ec819c09324dbec70b733a49d833a3b4f63f65ab089b2643b814. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/QM7282534364.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdded4afdb55723fe40061a561d5ad6ae9ccc5800437bd0d1cb35183474158fff. Chain 2 (Bitcoin): anchored in block 958920 (2026-07-20T18:14:22Z), 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/QMDA62515481.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c22998bc20b9b6eecac213e8396bbab823d4817e5cffe998003909d04127ae7. 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/QMDA62533155.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x433b206df68c4f4c4c156f0e6948ed9ac00f6ec9a8df965c8538819ed6cd612a. Chain 2 (Bitcoin): anchored in block 958838 (2026-07-20T07:01:21Z), 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/QMDA62582123.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31eb13ba201f7773e55ab81795dcd059a428f2cfe680d358439a29221df17bb3. 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/QMDA72596258.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f84e962995b79ce0e63a2d11d47d7a86c3d1bd394e62e0704ecdb7bff3b0b6a. Chain 2 (Bitcoin): anchored in block 958111 (2026-07-15T06:58:20Z), 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/QMFME2578261.