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 0xe2a8b4891ef39a5edd308b6da56319bf0ddb36e311ab5652eb75e8179cc4f026. 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/7bd07bc5-07d8-42a5-9801-2fad8c679ceb.json and https://artists.proofprofile.net/proofs/artist/7bd07bc5-07d8-42a5-9801-2fad8c679ceb.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 0xb3b3592c4ba641a89abb56868793819b46995ff4585ffb0c027174d67488de10. 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/FR59R2232640.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9dcb7a04fc500b1f41a47a608bb40f85afa543fe3ce3ca24b05a3e6b83c7bd4. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/FR59R2232641.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc06ccb606795e266996d7828c0f7f557a913c69ed55108aced1bc48fbf29396. Chain 2 (Bitcoin): anchored in block 960247 (2026-07-30T10:42:33Z), 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/FR59R2232642.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40b4ff8119eed0b14a52acd7a64094b3c82043d43e348316b3cef4b6fdc5919e. Chain 2 (Bitcoin): anchored in block 960220 (2026-07-30T07:28:30Z), 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/FR59R2232643.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e8ff397e7db5269172d99adc698c6da955d32fd6c565b6659e783d18102f2e1. 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/FR59R2232644.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae43912b58c65f566310022f2066b97a94b44436fcdd6df196347570e5fe4e40. Chain 2 (Bitcoin): anchored in block 960247 (2026-07-30T10:42:33Z), 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/FR59R2232645.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1c24e4344280801f696800fb7c10ce44dd791889a63d281022b9adcfc5136ab. 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/FR59R2232646.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe215ff0cb8d1eeaa4fb47b48ecd9ccd6f1760a19a85dd41cfa0001ec65b82039. 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/FR59R2232647.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x978fd6f9af7b157219acbef3205b921437f1c2e56f634d29e04e59639ef7a312. 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/DGA082481693.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3bfa2e881c037c9ad8bd9a0f149e70418c3580f29af46d656f4f87f04265145e. 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/DGA082481694.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf3da7b556ae1b1d7b7636697fecf4d21d6de835c0db40d853ba99daa31e95ce. 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/DGA082481695.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1f5bd02534499325a80f7afb7a068385307cde8e26fec24e0f0a74a8bf95b6e. 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/DGA082481696.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5be2e8067e5cc996f3a4031821631fd423565f43bbefaab759594b7cf32988d1. Chain 2 (Bitcoin): anchored in block 954130 (2026-06-17T19:07:14Z), 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/DGA082481697.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2780e9e9503207cd4b137f5aadc899c8f8147bd46cba40e0ac7e4791a93796ea. 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/DGA0P2353729.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x344b14546ce15d4070ac52052f390ebcdda6d081041b5f99d7841bfd419bc5b1. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/DGA082328646.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x927100ab56892a1d38729a8d1f4d01dbf2f8d4b407a1eb6ef2bba97f8838f630. 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/DGA072307667.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ae73dbf06afce3138877d0fc2ca9f45add681383f782d7fb274d50f87b93682. 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/DGA052369613.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x966b3d3b8e90cd77ea9faee1654716e09db77d58bcce63521b8a8a48f2acf45e. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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/INS182202206.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeedad44301894687ac682d144411556447aee487d2302c38cf9c97875727241d. 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/INS182000760.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0c8a995cb7c354e65dddf4f0e8daa4ffb11e5fe429b2007c2745768964988ee. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/INS181904218.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9634c894c07b054d6d3db5e1e6a289da0694346efc783f5c22bd39d84a81dea4. Chain 2 (Bitcoin): anchored in block 960105 (2026-07-29T12:35:17Z), 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/INS181900449.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x108a2ba5e2b0926266cf55b007d39465a0ef74f84f52246e3faa579adb5aa028. 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/INS181800573.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf75ef98a178aa4ddd084f000c355317459c3ba647099bd7254ce1d5a93381cc6. 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/TCADH1709905.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb418d922306fec1a16ad243bc6fa74439714d90f767a43f9896a69e98ceaf9c. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/USHM81737984.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22ca0076a3bf67bffa7afb596d8003ef5d32c6d2327b69d4df6a25b7b0f0a2bf. Chain 2 (Bitcoin): anchored in block 960105 (2026-07-29T12:35:17Z), 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/INS181701063.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6acc7f81f8b71fd617c4b93aae6fb55b22b3be2badec614e78dd92d59c927b26. 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/INS181602035.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41bbb90b2432010833f8ef95ad5e6ccbc0da8d2f7ae919a084bd219b119d76a1. 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/TCACL1633546.