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 0x5529d5ec33f64463ce194467906fcac97138356159e400d500f8ad61a159b0c0. 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/35e58ef1-c1ba-4a5e-9c7d-315bc2e10eca.json and https://artists.proofprofile.net/proofs/artist/35e58ef1-c1ba-4a5e-9c7d-315bc2e10eca.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 0x1f16f13038fc1301c69648aec200643837575cb82f1d01a386efc24933239022. 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/NLRD51959691.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65cfceba7a4e295b7b001496ccd848ddd0cf7911fcdf0de5b8294ec732b0c2da. 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/NL1ZN1900151.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa38e8b7349bf393ab21d4c02afc80721e2aba8c5398fcf3f178b5f3beecbba17. 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/NLQ8D2000067.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea1312cd9e356160a9bbe85bf5b8616e67f3b9069109be2bf1172621e1c1a7a3. Chain 2 (Bitcoin): anchored in block 958876 (2026-07-20T12:15:48Z), 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/NL1ZN2000087.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c7c31edaa1adf6cdebdb87682467dcdf77e5ffc854a6fe68a50f13ff349e626. Chain 2 (Bitcoin): anchored in block 958517 (2026-07-18T07:54:29Z), 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/GBLFP2089761.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x933ea5b41be7dd946c88fb395988ea4fc408c52d007bd9046ed1aa3c120de1e2. Chain 2 (Bitcoin): anchored in block 958690 (2026-07-19T07:14:39Z), 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/NL1ZN2000355.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd6f19b17ff3397516e2c365d1a6c48f08e3f382fccbce1aa5200faae31d37fd. 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/GBKQU2130001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a1f243aa67f64106c7dc02284d385c927d927a901d3d4d77061a22db76cf97c. Chain 2 (Bitcoin): anchored in block 959001 (2026-07-21T11:41:42Z), 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/GBKQU2130002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f6e64baa2997c3d7a7bb31f7ed7de3fb35ca36445a012d58a9cbaa412a35e15. Chain 2 (Bitcoin): anchored in block 958371 (2026-07-17T05:45:43Z), 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/QZS672149761.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0fb9efbc23642f9e60b653a0b5b1cb71d13c7955a85b8177c8c037fd05d2f98. Chain 2 (Bitcoin): anchored in block 958170 (2026-07-15T16:21:50Z), 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/GBKQU2353234.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe36fdc46f5d7df57d9672c641ccced50d606373778a6254fc58f532229c62584. Chain 2 (Bitcoin): anchored in block 958349 (2026-07-17T02:28:59Z), 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/UKZGC2404509.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca922946485b79fb7a2aaeba4fe783677006ea5679ca7b327ad333eac02c6ff7. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/UKZGC2411183.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c1b78bed06ddcec26b6a8e17a2519e0f88eb2f0660daa33647b2e6bd5c89a60. 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/USRC11903674.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc85506fc064801e5233870ff64e695c6afc6a05c1e390f99da75375e4547076e. 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/NLRD51859531.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0cb0696342c81fdca7e22a63302dcd754d5512ecea3e0c9ca23fad5f82523200. 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/NLZ542002005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a97978323b411b05ab2c6ad23d5d93fb21049e880bdfc9ed040327061e17fec. 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/NL1ZN2000319.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1001bc920432b75a8ab1eeaf76549aca58c24aceef24732f737fc56940640eea. 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/NLV5Z1900034.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde3ccd0bcae9d946fddbbcb48dcb1c5e1897a6b0140feb4866439f551b1e1880. 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/NLZ541800215.