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 0x73ee00824348e1af3968e91e32830cfb059ec0267fc78d822c46e657ada5167c. 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/6df77df2-bc79-4fa0-a074-7ee5e4ef4b05.json and https://artists.proofprofile.net/proofs/artist/6df77df2-bc79-4fa0-a074-7ee5e4ef4b05.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 0xfbf6d713fe97a35087899b00275c99ede40ea81b99ff2c412f1ae7d6da840bb4. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/QZZ8B2398423.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86c8c08258e2c86021873499fb8daa4fd0c8724d17243558774832979c13e8b3. 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/GBLV62301380.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84d2f6a6b323649865fc1d54d19273fa6ac9bf6db93efa768efb6769e8eb74dc. 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/NLXV51300874.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xffddce6eb078c9cc4c884e0756761eb8a715c7291b74978fb5de94d7bf998d06. 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/GX4R52383161.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc98689900a71ea6818c1c53621fc71ec309d678aeadc40ceae28ef1922f4aa2d. 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/GBKQU2377948.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00ac85e434d03e93646ca40590ef8636e5124d0706c934205cb404a955b3bdb1. 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/NLZ542300798.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x237d8fd41613a8023b1d49b830c4fa6b4824887621425723666a63ca49bfafa1. 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/GBKQU2352712.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99665c7e83fe91e766927efaf90d3ab391010298cb778e596b95b4511f72e6c3. 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/GBKQU2345035.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc086755d094f4b64af8fa1d0fd77061d0d45a336f93fa95f093f6b7dd72caa4e. 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/GBKQU2343044.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c8abb2d849061104d821e45731975061327e3c48e9880d82880e60b15458d37. 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/NLXV51300747.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe600638581874c34eaed3d0e8913478b747a14e5a42410cb46f55a2fc3060c7e. 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/GBKQU2325617.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9accad177f7d9955796680400eb29926bdf890e08921e6cb1b439d50f0cd9aed. Chain 2 (Bitcoin): anchored in block 957075 (2026-07-07T18:50:38Z), 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/GBKQU2312095.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7410775fd4ede2d7d7c94d2bbcd8917afdf5622a93895a99fa47dd6394bbd608. 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/GBKQU2306234.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e405f7075a1fa429f2f496e61a65bb2ab748bea7a4fceaeef7e5d2a47c2e5e3. 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/GBKQU2306235.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4068f975e2d206c845adfdcb69e3f8943adc47d2419b923cd4c58960baa98d2. 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/NLRD52203621.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0e4beba200a8c9c486aacfccaabe9bbcf35ba52c49ce76726d74bfeb28e0193. Chain 2 (Bitcoin): anchored in block 957084 (2026-07-07T20:41:57Z), 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/NLRD52203609.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53f40f0b728c19d9fa80e0e1e39992f70612426e4a37d7f814efaabaa31fc1d9. 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/NLRD52203587.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa91fa80896804e0ef87c2b509de30a187629713bef5547efe43d1ffb9b2d01a. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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/NLRD52118349.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaba2fdba936f85561cced8cd361c7fc4272876e7d8153d4057e40e5faad10b5b. 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/GBKQU2244203.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcfc08a692d9944d05312c8907651ca0c57f8392536e2132083bb49a4e363d66c. 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/NLRD52118327.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27d139d31b904286fcccceb12eedb20da2d55db3285e35fa75cf3db0d9046835. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/GBLV62103138.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f82f630075efad52ad303a4698adfa3c58cc0e038d4edf89a3a541214ac8f51. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/NLXV51300430.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8c0b518fd495442762c239b626decb5e354d111957bb2e95d05a8d6a8f0870f. 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/QMFME2141431.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe900bcb9d7f2a08eaedc401f04da87394c16eee5709e4dcd0660bd66c2ffcf9. 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/QM6N22146336.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab45766c5fe4f2fe3ee662d91230bba9376179edb42a739fb22b9d9119072c18. 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/CH6542128048.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e7de5937bd7196d0c5f50d2186aaee31f2e9e480d74d42000542c3685f4fef4. 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/CH6541647223.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d9a606a6e3890c7fedc5ccbb25f591c0372c62c1ff48dc059eb436f70a7a6a3. 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/NLXV51300310.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7ec13bf6d1caef22eeb13ef1d76698938f8188776660e0c8fda06a69610d499. 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/QZK6N2015070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0cf9780e9c5d0b93246c90e33f10a0cb3e93377e34c0ad2776a6b4dfd969a091. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/NLV5Z2000025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69792cd5ceeb0dfc47fbe7b0a0482da5d56d09bb3e27c4877bb7858007b0df26. 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/NLV5Z1900152.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8891c1d3261a4207d2061f370f874c4716fcde66916cb50680246ee0f8ff30c0. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/ITW881900266.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe86b084750a3717e08b74100984aabdfde97fa617c6af88bdcb41398802dbd6d. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/SEUM71501661.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2957ed3604de26286734fa5137ef1b4969624311112f3fbdb45582ac7a9bfbc. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/SEUM71501662.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa236c1958ee96997dff7a9a5f4cfe05dbc59b6e7f5c3591228c5002a8ebd69eb. 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/GX89G2450206.