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 0xe0889998d0686062aa364cd726e34dcf549f89764cf8e03a3a0cb3df0f795954. Chain 2 (Bitcoin): anchored in block 953791 (2026-06-15T13:40:30Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/ddccf366-9c7f-41bb-b526-1b9103ccfd53.json and https://artists.proofprofile.net/proofs/artist/ddccf366-9c7f-41bb-b526-1b9103ccfd53.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 0xc58602408714e42c2af7abc610adc4518fe09cdbed8f3cceb14703af22c59af4. 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/QZPLS2411028.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8290347d9c0b1e03205274aa557db814a8bc6694aa143117f3e3f2e3110bb9a6. Chain 2 (Bitcoin): anchored in block 960250 (2026-07-30T11:13:28Z), 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/QZNWU2413132.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac8d3c7a62526e2fc76112910be96f18c2bcb6bd242c7f363f31da56b6c86dbd. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/QZK6H2448994.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a14a85dd9077cc65d384fb9ca64e42c22d6f036774da6eab2f4814e86f841cf. 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/QZK6N2493500.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8dfe168a6d9e70e3ad7e6ff1a7795ea9e75198b938776014362e14e629418130. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/QZK6P2464472.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5cddc9e1455b7b30385e693b57850f22f33bd88a8bf5bd3a23686fcb938ff85. 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/QZHN42490252.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f1a5d140428c383f942386bcc531d5a9e10afd3505e08589ed65c6476e3bc39. Chain 2 (Bitcoin): anchored in block 960489 (2026-08-01T00:40:43Z), 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/QZHN42490253.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5bda59dd394aa96bfab76bc0dc743f79311317d9006292965854c0425c6f0a1f. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/QZHN42490254.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63c0df761f2c3e5df3f1530659744206a15e97a27daf9eec2e7dbd229f640ba2. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/QZES52463121.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3fed6e6d389c45b948d469ab9d2e7ece94dfaf9f1c6587daef14515ceb2f3eb1. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/QZFZ62470874.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e5d1d9a348f88324fac8860d928c2a232f9143f46e2ca5b1e936d5bcd5fd1c1. Chain 2 (Bitcoin): anchored in block 960509 (2026-08-01T04:30:37Z), 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/QZFZ42486773.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f6e61db8e5047fa46ca88cd8f6e6665019fe7622e4c5c97dcf19e8e6ec98104. Chain 2 (Bitcoin): anchored in block 960317 (2026-07-30T21:35:24Z), 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/QZWFK2389315.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73c7e2ef2b91e627504023b8021d19491f3b2c9aa3dfec4cad0d3aa0d55b8f4f. Chain 2 (Bitcoin): anchored in block 960106 (2026-07-29T12:41:21Z), 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/QZTB62347407.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1122d6c25dde8b392ce2468d1757dec77bddae7798f8ce8e5ca39732d78ad198. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/QZTB22358274.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf15f5155a24f328d03676203c1a44de0ac5191a3d78998dabe1b3b91fd99568d. 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/QZRP42389944.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc64021c8971577a2845300b8656f1ea09ec713c6d69328ca326b166a78e6e4e7. 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/QZNWZ2310220.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84977a236bf4cb3175852ed5e9841845daa59305ef67e44761a41a8731335a41. 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/QZNWZ2308221.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb615d2e390ed507ce6a3da45e56ebde40ad3db6e6350c25a7c4bee42b00cd709. 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/QZNWW2303032.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd06103e3b61b808fcc7cbd8c418fd37c648e4e0e34d9a9c6400f34279262e525. Chain 2 (Bitcoin): anchored in block 960489 (2026-08-01T00:40:43Z), 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/QZNWV2335346.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a706fd9964abf3c02dcea9ce404e51c28776a6519cc9a7a2b26c6c3205c42f9. Chain 2 (Bitcoin): anchored in block 959137 (2026-07-22T14:03:35Z), 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/QZK6M2394636.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x510179610cd57a9adc5d0eb8b98542302f40f904ef19a7b55fd4a7569e357b68. 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/QZK6M2394637.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c820db372f9f5390bfa5ccb6ba7472cc1308a0c33a079bc8f5253c47d808045. 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/QZHNC2361468.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92878e252243c155821237c29b0b3f8d989f80768070a548307370779c289faa. 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/QZK6M2363975.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c4bbc4f31a959bf06d184d79265326c5e538d28f68109226ec792c5c2c5c7ca. Chain 2 (Bitcoin): anchored in block 960175 (2026-07-30T00:16:15Z), 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/QZHN42373798.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e0532072de7d8994d191f1b12bf46a4ae80dc8b36ae30dfd28681b232d323b5. 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/QZHN42373800.