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 0x7c3aae8346e56c30569e2fb0d681b14c1fabbf2badaac51295fbfdcc4cd0acd9. 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/df3b3e84-3991-4d81-8208-89a93f1403a9.json and https://artists.proofprofile.net/proofs/artist/df3b3e84-3991-4d81-8208-89a93f1403a9.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 0x623cf4c4d6933990be4c54e437409683449259bd9a150d01725859b77ae54d01. Chain 2 (Bitcoin): anchored in block 960200 (2026-07-30T02:37:10Z), 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/QZNWW2421493.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3e8253cfae05faf806846c3d7a0ee90d1eab1ad00524193dded782c487582b3. 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/QZTBE2383250.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5ee58f8b963ea6166118b7485cf7de740cf98239075bdde9626933236727a99. 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/QZDA62389367.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb50fa61f2c225e9d66ebedba845c0b20c08d4abfbc62bf3440eb11f0405428f4. Chain 2 (Bitcoin): anchored in block 960266 (2026-07-30T14:44:50Z), 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/QZTAS2286554.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3865b7541980a0d7212dbe1ddedaf2ee476a735e1926119e8bbd88d255f360ee. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/QZNWW2219243.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5dbad673bd54e9ca1012bf4210ca7b1002a019e5f86969f12381a8394e978824. 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/QZMEP2256201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76e467f56a453d3e4b83259813e6db6ca30f37beadede4c7b189d2bb4795ba3b. Chain 2 (Bitcoin): anchored in block 957052 (2026-07-07T14:50:41Z), 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/QZMEM2279103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x120bfc8dca1d204a47d922d10d73308af6469d7e1465803420996121a68921a5. 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/QZK6F2273599.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0263bfc3ee0a654893e22506ac2002bc49aed94be7f8a092e099774f3b3623b4. 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/QZHNB2224124.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2fab9ed15e91d49c93ecb8d876954960c8744476e66f8dab68d165e99f1fb964. 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/QZHN62289105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeaecd9c98fc6b52e555b821057270e6a8f2ea8e31c9e9d6f02d5536ca6b8b9f3. 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/QZDA82290976.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6313cd680f6cd5ad8b6110bc3b96ec94214f426feda47cbb9a287c9683438e5a. 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/QZFZ72217556.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf12b2a5df01d4e1dc7cec1de3950d269d30174d9ff34d4ab9b886d82e72c059f. 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/QZFYZ2244024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa365dbcc5d66fe2a375eb430e3b55106a93dbb37584a00105cd55f12258f2339. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/QZRP52124499.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xddafb71b01a18142e71060e37933e0daea989259b3c52206a90b095a2fba862a. 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/QZNWY2179155.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8fd5de46ffae1895276a7e326688098a80a24ba6ff6ed795f290f502b637f50. 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/QZNWW2175180.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98193573e30529114084310cb37ac1b8d2defe201e6faea2fa08a65774056392. 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/QZMEN2149305.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e609ca1d9eb9beadde2d4f31ccb86f495117014ac548c9860882f26eed1e39b. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/QZK6K2184097.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf89842769bf7af270f2bdf71c98d05521ab335a9767db37c709c8db3918a5828. 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/QZDA42245496.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d7b304464ba21d839a5ffe8c3196361a6d3921e3cdd50e39464b5df97fb8efc. 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/QZFYZ2220590.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0c3c4220550a4971c6433a1dc1bfcebefacb55bad3a2c40a92a62a3c5a20e6d. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/QZK6P2204338.