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 0x3370079885fac80cb360e3d863e68d08dd5a62aabc329bfcdcb6eb2213abf546. Chain 2 (Bitcoin): anchored in block 953625 (2026-06-14T11:37:06Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/2a6531a2-e969-464c-8e68-9c775ad04a89.json and https://artists.proofprofile.net/proofs/artist/2a6531a2-e969-464c-8e68-9c775ad04a89.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 0xa860fb5e3f098e5b127341b3c9af3d11c31daddc2eef0a4d22b008d23ba1afb4. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/GBWUL2346284.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34c49d75504ad201e23d425dd4e3345fa00af9adc64b7d3b6e17c08bae009cd8. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/GBWUL2346412.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2127e3032563918c0107866f03d3ef57fc30cea4d9898d4e00f2c78092468a9. 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/GBWUL2346424.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda32cdf3dee58c99637b20797099fe5d61d5f7b7553f92997a766932a619ea89. 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/QZTV32446564.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04377864df8fa088d7cd95cdc7c80f1555951118973a6b3ed139bd8f236054c2. Chain 2 (Bitcoin): anchored in block 960410 (2026-07-31T13:50:38Z), 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/QZTV32446569.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2eb9ad59fa2dc9826120be9ef35a78c0e3c79bd79b59464c2361d44d5165846b. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/QZTV32446571.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45c2e2564d6b2703b285ad3c8d28d059a64592efcc5d9ff8a028548bbc3f6ac3. 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/QZTV32446572.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8a5266ef5726ad8af5ca902cff5d065e7e688aaccb236e067d32f3e0e78c7e1. 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/QZZEB2315550.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5af88081b30f4c789e247f28ef047ebb0ce46202426258d921c18db094ac47f0. 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/QZ5AB2373425.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02882dc8f11429e81a433b31e55d96aa8b823a77b8fdb532c1e325af70d4cd92. 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/BXIV82185647.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9fb020e7f216173babd48f95939e825a3349761ea225688d203ac53af3da453c. 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/QZZ8B2411141.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb71c5cf957358ae7723f883aa904397dd2619abb61ee03467e1f93c2a89e0b8. 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/QZZ8B2411143.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x898120fa777cc0fd3c34e58991811628aaf693d9cddd3304a2c3d99ef1d8c8c6. 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/QZZ8B2411152.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x547b004fa869bfe582f3f425fb932ecc3d9e2308f58dbb92222cd059cf095b83. 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/QZZ8B2411153.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd9e2451c1f3241cc263dcff7fd10a0144cf7e9de4d3d26141687ffb5f546b1c. 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/QZZ8B2411157.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92758bbed64eda9f9f141fdca2c8b5d56fa432103892b988f32d444625ae5d87. 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/QZZ8B2411159.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa27a07822ece8d54a35f0b12a81c7394b07c989543cec19e98aa551f57bc4095. Chain 2 (Bitcoin): anchored in block 960370 (2026-07-31T08:38:45Z), 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/QZWDE2416447.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xedff1a9bde699df0c1f55d11726387bac0c17cffa18fde20f42772b690c8e64c. 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/QZZEB2467358.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d3ce98be54ed6701cd1f400711c573123178cee0c7b376fa4d91bfdc04bc525. 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/QZZ8B2426814.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5fa95d5c5da69a4fa0b1ae9275d737d0eba8d556e2db2cd7d6e9fdb96cc6a103. 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/QZZ8B2426823.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ca071a742f8b934db1ada588fc9ecc2739cc74df971fc6cf211bb8184371320. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/QZZ8B2412215.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d1b1e9dd6c1e6d5d8de4fe9766e8796315573e1da980c64826e61b98bb7cbd0. 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/QZZ8B2426826.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc49300a3ef6639aa16721485816ed0f0015e4834a7f8263ec08a64664a456d4a. 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/QZZ8B2426829.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7bb871c0c20cc3049ae1eba5e4a860108a5088ebe76122233d8ca4cf374b4baf. 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/QZZ8B2426831.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ca071a742f8b934db1ada588fc9ecc2739cc74df971fc6cf211bb8184371320. Chain 2 (Bitcoin): anchored in block 960240 (2026-07-30T09:57:33Z), 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/QZZ8B2412215.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88f0589f5129ff861eaaf24064e61f4774c7910cb7c15d0610bfd8bb04471ddb. Chain 2 (Bitcoin): anchored in block 960435 (2026-07-31T16:33:26Z), 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/QZZ8B2456319.