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 0xb9e1e128df69d53ef93f4b20ecdce6e17b3fbea3ab3078f7899fe08a7b94b058. Chain 2 (Bitcoin): anchored in block 953758 (2026-06-15T07:48:25Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/b5ce3a42-d964-4270-b878-7b288b123d21.json and https://artists.proofprofile.net/proofs/artist/b5ce3a42-d964-4270-b878-7b288b123d21.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 0x4c980ab173d0abcf16c12bba4d924c3968dcb2c1626fa4ca954b6e8f7deaf7ea. 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/NLCK41054504.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08e1612a064f043fdd5f6425c5e458c2fad3e6d3a5b4ae4f06cf1f1cf2979911. 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/NLCK41054507.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13b11a01978bb41f92691ad45e5acaf9aa33efce70158f094789ed7a3879fcc8. 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/NLCK41054509.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x030de16d1dbdad14e914370cca7b4d5e7f05831c384ea15dbd657b6570c1a2ad. 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/NLCK41054510.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x892d2457f81137d7046cc08f2286c8045482b3fae25a42c5fad850f88364e3ae. 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/NLCK42400333.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdfbd31fef14ce2696ea20267b0910ea41e345ba6379b748e5fd46ff9b8520a63. Chain 2 (Bitcoin): anchored in block 960157 (2026-07-29T22:12:10Z), 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/QZWFQ2397260.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16057b99ac9e0e204b1226b1a296426235e0cd9c63eb2bdca9855299b77c4c7b. Chain 2 (Bitcoin): anchored in block 957055 (2026-07-07T15:12:44Z), 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/QZTB42379154.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91fbb918bf43b7662420e7e85bee72b0a84d0a01ff2ee40df151955b5b0ef513. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/FIWMA2200437.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58a3e307c1561112fd4c46866799c555c137347d5bccf7354487aad789e2ba0a. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/NLCK42212603.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b37219e8507ed7a3b387b2cae2f8edb3efac304142dfa0a445e831cb0dd25bf. Chain 2 (Bitcoin): anchored in block 960314 (2026-07-30T21:00:46Z), 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/NLCK42212604.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4cdbdb49f9a964bc71ba36723ff030b00fd4b2532933143f093b0302c8788817. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/NLCK42212605.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9602998cb8d07f8be88576d76da0bd99708823026689d0b7feba5efaafe0b2a. Chain 2 (Bitcoin): anchored in block 960209 (2026-07-30T05:15:54Z), 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/NLCK42212606.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67424e4a454ab18f03b66526257082937a0cc9705be014b9d154942609dc1b3e. 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/NLCK42212607.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x998aac17b80adb3ecda595d5e2b780f101b223044e7d49fa3f386a3abafea1f5. 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/NLCK42212608.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23522900b8c022dcc0e1cac206a61d68094813743b7f5985de2ecc983aef7a93. 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/NLCK41063491.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61a19cdf9b2291ee05d72a12444ade40bd2c7e40ca1cfff28145b4120682abaa. 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/NLCK41063492.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe0caae1775517b7f1e5fc8e4b2643ffc1af32d914ad546d0c8c2279f2490d0d. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/NLCK41063493.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x522346ba7e85f37f421c7d699597e7a0d40f1d3fedb0c1c0bd549d6e526f4058. 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/NLCK41063494.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6181b3ee5f4f623f2b0e2516fa0f6a05a082c41775459c64f201e409e0098bd0. 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/QZK6K2307571.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15c2dee28e47b755f9d51b13edad954db0a1e67304b38fc7ce98b131252ec0c0. 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/QZK6K2307572.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03694b004861f4b4bf1f9aefc12bd53e32d8cee36137579740cd394487d7768e. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/QZK6K2307573.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc0aef29a77f1c06b4577e0b37716e67f8fd1f343753bb5e75a8a91081007649. 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/QZK6K2307574.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2704fbb7ebd440c1c06a7de9aef3367a5c4d10120399f2c6256422f3a578176a. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/QZK6K2307575.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdfbca5b8f3d5a8f2b4a473109d3144cdc47eeaab48a2138f259a12019e0d20db. 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/QZK6K2307576.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0556143fe98f453ba82ae15b6f97543823efe81b6d68a3126d1e3a94ed2508c. 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/QZK6K2307577.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0adf4c24ed6710aafb2d024f070f57f35675e0094cc8087d191661575b25ed9. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QZTAY2352389.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76b48f6d60ef7f32a08ed02c2b4c8716321f229ee85a3a4ef8490a355aca0292. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QZTBF2393923.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94c90ed4de6039809e9e92d05e22f8201baacba893aa216b0d0a1a81fac84073. 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/QZTBF2393924.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe1a2455164b5d822a202ba7c6b1cbbf0436bba9d3f37db0e6a52ec3fbb8d018. Chain 2 (Bitcoin): anchored in block 957046 (2026-07-07T14:04:01Z), 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/EEKE12200001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e86d66bdd544c66357a9ce946450111c467661c68f668d107f32b27e4a49652. 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/EEKE12200002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67d558605ef6d12dc5d12c08edf2e0b44d95f8649bb043ce42f46c571ea2a216. Chain 2 (Bitcoin): anchored in block 960340 (2026-07-31T03:15:04Z), 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/EEKE12200004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99a850431d391aa53a2cef484ed0b49d14bb93c7cda21fd43f07056d2ac59e3f. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/EEKE12200005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfecda19678875620ae4b3942413543dc41981294a381a5fea71234568951df24. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/EEKE12200008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d3bf7d19ae6849f60c63e27e2b0ff844e48ea64d5dfab62cd951950107193ef. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/GB8KE1859402.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd41cbcf4b18ade837345132148d19568bf9b7e18c67a48da4acb143d3ee9fdd0. 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/GB8KE1859408.