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 0xb0320d2f1dcdb2a0e65d17e0d45bf86d3cc97039a2cb873321bee12ffb6861a3. 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/7dd29562-3607-4307-97d8-9aba3d5bffe3.json and https://artists.proofprofile.net/proofs/artist/7dd29562-3607-4307-97d8-9aba3d5bffe3.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 0xfd21b327aa2d7d147f6031428c4e316acfd8c08f462f314af02b29a8ff804647. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/QZNWV2193050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaaf87aae4a3c9137275ee22a48867436b931a2207ee1637eb9eb52e72b612ea2. 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/QZHN62263854.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x686af9d7e1b736c59001f1c284e11c51dda707821bc8b148d96a2e2c68fd41b0. Chain 2 (Bitcoin): anchored in block 958455 (2026-07-17T21:28:36Z), 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/QZRP42408338.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44bd7d0ff33b3e6282f8372c9f4b2a73317c3e1a6d11d1a4722984f9fb4bc430. 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/QZRP42408341.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa914ba152d542e5301e7ea45bdf73173892b9bf9a0b4b1d66db0c61cb4cf628c. 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/QZRP42408344.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0f1095d7e2c12a7df5652c1f35e202ddaa45ae7025c3b9fc9ec046d9a5d6535. Chain 2 (Bitcoin): anchored in block 957833 (2026-07-13T09:36:32Z), 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/QZRP42408345.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d1dd52933f5e38085b8c99b2c12e2dad06385ae684810766b4a08ff6ee5e208. 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/QZRP42408346.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe03ace4f65bd38b4d8e9e2c9bbc30e6a7551cf30ae8c545f5fe9870b2d437e33. 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/QZTAW2444468.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ed302026f81f0fe25e502fa303fe987be7a6a7e765e847fda6acfd86eaa762e. Chain 2 (Bitcoin): anchored in block 956576 (2026-07-04T02:06:47Z), 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/QZTB92412197.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16602f8d7ab15ee79c3195fdeae056e363a832bb9701ed9083a1f7ca26ec9d87. Chain 2 (Bitcoin): anchored in block 958860 (2026-07-20T09:58:28Z), 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/QZWFL2493195.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14ca7e5a53eccf1e2b0de66484501c10f048cc8fe7e1aa7788239575d3f298b1. Chain 2 (Bitcoin): anchored in block 958988 (2026-07-21T09:08:06Z), 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/QZZ772413549.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08a9ba47612ac53c6de91adb070d6a928bdc2347bcd7b100ad2939aa79b1c39b. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/QZZ772410630.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a7524671117954565e2f192541f3e29afdf1f1e05e05b248245190ef61bbae7. Chain 2 (Bitcoin): anchored in block 958631 (2026-07-19T00:50:09Z), 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/QZZ7N2418753.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0bfc70645a79b2ef9c21801b6ef65be4dfd7c0462c0dad62a9699184f60480ec. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZZ7N2418785.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf98c5e9c1f7c02accbcfeae3c89a49c3e4ef30cfbae06f7b6554278fdd7b5261. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/QZZ7N2418790.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5171e64bae86f4c2258de4903dec00ace1bc0e9e126f622b033881e58df5b6b4. Chain 2 (Bitcoin): anchored in block 957770 (2026-07-12T23:17:00Z), 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/QZHNB2588259.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47d0e88c15813ffeef723078640c23ef2a6212e9659afd7a1dbad7df7ade62fc. 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/QZZ7N2418791.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf998a2869d0ca4ff94cff2699ca80d84eca527660059caa674d60c4464d0fba1. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/QZZ7N2418792.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce1761581f7f3e98e7b79e237f459e0361572de3408ac594f9c7a5a5fe19aa0d. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZZ7P2485012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x336039a438adb671c4ec693b695e67d1c4c51ff65febaa2c7a8bece6dbf7d1c4. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/QZZ7S2468581.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x376b2a832dc720e8cfd1ec2114296aca2000bfb99cf2e6e416da0c3fb52bcace. Chain 2 (Bitcoin): anchored in block 958331 (2026-07-16T21:55:37Z), 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/QZZ7S2468701.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x801d0d153c4cd934cac8aeef87a5927f9553e0d00711901d14a36401989248be. 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/CALVP2591405.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d5d90262990306cd64895d4324e11dfa7024a746a7f0f1ba7cdbaa80cd051a3. Chain 2 (Bitcoin): anchored in block 958383 (2026-07-17T08:20:01Z), 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/QZZ7X2484140.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6030be91b3ea67858dfcd7588d9e51c1898c91a7d1e8370e85703ad20e981b76. 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/QZNWU2573188.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d33b8253d762211b3f20a6e9bff007d62124c9bc7ee58624fa28727751f2800. Chain 2 (Bitcoin): anchored in block 960506 (2026-08-01T03:50:58Z), 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/QZHN72414172.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb87b9c8c47ddd6131ec15d0cc280babf17b7789eb8e9f236bc1de5b7d3a9acc6. 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/QZFYY2428648.