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 0x50cb1ad1ee3eda2dea781cd7d27fdd23924bce80695a00cdbdda1b579215e392. 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/8be34719-dd6d-4984-9c3c-9fe4fb6f6d77.json and https://artists.proofprofile.net/proofs/artist/8be34719-dd6d-4984-9c3c-9fe4fb6f6d77.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 0xb5b094250643e79f0796b297f1c6c91d4352ab4339fe2736fde8e28709096f65. 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/QZZ7P2461807.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7dcb5d0617ec4510459ebd9aa0532d7c34051439ac5cffb49c4722b82d8cff4. Chain 2 (Bitcoin): anchored in block 958955 (2026-07-21T03:03:40Z), 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/QZDA42500239.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc82dc56c5e386669deb0dbec800a361f4b49d63fb5d07fc0733649decab8ac4. Chain 2 (Bitcoin): anchored in block 958822 (2026-07-20T04:30:07Z), 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/QZES62510525.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdda9a5fe1d6752dc1c5665569be940d48607a0bc7ce56d7872dc0db8ad44fae4. Chain 2 (Bitcoin): anchored in block 958417 (2026-07-17T12:56:50Z), 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/QZES62510532.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7dc2261d316536722a0281665938b91f009f2466ceb7214d9b6c575076871e3. Chain 2 (Bitcoin): anchored in block 959051 (2026-07-21T19:48:03Z), 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/QZHN72587583.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x154b687ccdc9c7849c3f82acd80e6f8ac8935199ad273e812f3bcbd4be5ccd01. Chain 2 (Bitcoin): anchored in block 958357 (2026-07-17T03:33:42Z), 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/QZHN72587585.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea17df1ef2887331ae3dbb334b99f492e0ac511fb0f3430f40ae4ba234db6ccf. Chain 2 (Bitcoin): anchored in block 958079 (2026-07-15T00:21:05Z), 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/QZHNC2523263.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5c3ade813a43826ed2b7035ea08ebcb180c822c42d721a9a98f2bc9e6f9ce4a. 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/QZK6F2541586.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7eaf5e6e09c6a069fa3b385a2b68b6c3e6885dd3ae944b64f688283f49ca02e3. 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/QZNWT2555357.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61c6e670d57933b4c7f4228d625e461f964f4bf77428df25733254ff57aa2a01. Chain 2 (Bitcoin): anchored in block 958401 (2026-07-17T11:10:25Z), 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/QZNWT2555361.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5a838643ae0159f4d8d62603a8b7934f9a8c7512855207e0b4e106041523d4d. Chain 2 (Bitcoin): anchored in block 958853 (2026-07-20T09:11:53Z), 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/QZNWT2555364.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9df4735cf511b10b3b713e5f5620833d99ca74ce2f914955572b2a806f9ad704. 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/QZPLR2529588.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed7731561ca89a4a55d188368ca669550dd2b9fe357f69a9d9036286e1925860. Chain 2 (Bitcoin): anchored in block 956476 (2026-07-03T09:04:44Z), 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/QZPLR2529590.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58fdbe4b58c4b47800d413b00fc5d26ae360bdf7fe23e95227d756385f9a1d1a. Chain 2 (Bitcoin): anchored in block 958842 (2026-07-20T07:48:27Z), 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/QZPLR2529592.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38c034f31be7cd412f27ef64b9c1ad5ef869e7dd441449bd22e9b49d0ce89885. 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/QZPLR2529597.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d924b6b00894be03e48e5e8e0dc41dfb0798c7b1eab5b18b3539dd380aedb8e. Chain 2 (Bitcoin): anchored in block 958596 (2026-07-18T18:42:38Z), 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/QZRP52559858.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ffcd0803ba5256c360d20e022a6e53875c49d42c7cd876371eee00eb1efd576. Chain 2 (Bitcoin): anchored in block 958853 (2026-07-20T09:11:53Z), 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/QZRP52559859.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x857f25b9191823462d9adc77153263e9e2c28c0d76a4a532713ea9f2175b82cc. 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/QZTAZ2531789.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e4b890ca0a2679ab19f04727d4ecfa3452a1d7e8a8b8d50ceba210ca9fd7bb1. Chain 2 (Bitcoin): anchored in block 958436 (2026-07-17T16:42:22Z), 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/QZTB52583899.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdac02eb826ce29ba9f6a22b2813eab8e03126c9a6b9fa8da7d50cbf21538cdd8. 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/QZTB52583901.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcae7f69baf55fb4b369bbea22e4ca698a165616dc333c242ba525d7de61df76b. 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/QZTB52583904.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1463f26114dfacf8e331d5d85efbb4bb4bdeda0d6a174604e6198a4e8eb6f0f8. 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/QZWFP2539457.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4059985f60da0f11466f08affb95e229c0d6b91f7ab88d5c488762104984911b. 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/QZZ7M2580062.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d26291df4658cb40fe49549a7b53fe23e8ab8fcc80ab38c4f316f8b72113dd5. 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/QZZ7M2580064.