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 0x084b344cfd3299dff187f310410be4dd0d3ea52d1acc84efc356a6d1b4b4b9c2. 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/13759a99-97d3-4942-b5b8-3b604d758940.json and https://artists.proofprofile.net/proofs/artist/13759a99-97d3-4942-b5b8-3b604d758940.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 0x389658d8d0aa2ed8290f8d195c377e36a1ddbdc0711052699c1abdaa3db304ea. Chain 2 (Bitcoin): anchored in block 957676 (2026-07-12T08:20:25Z), 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/QZDA42192775.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x111a793a3d5f8136e5a6a6351221661a60cb88697e2392e13e7f5c7fd346210e. Chain 2 (Bitcoin): anchored in block 958558 (2026-07-18T13:44:16Z), 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/QZDA42192776.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x438baf305aecb7b75ccf715fadd8e474740e398082566886016d528e286fec7a. Chain 2 (Bitcoin): anchored in block 958079 (2026-07-15T00:21:05Z), 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/QZDA42192790.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ccad11fb3e196697d3ca560cc6360c28426f715564fb925eb95833e921ce9bc. Chain 2 (Bitcoin): anchored in block 957674 (2026-07-12T07:50:41Z), 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/QZDA42192793.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e224657e7596e9fe72fcc49529bfdf3de3bb14fddbede2fba1b0bfd8eea6c87. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QZES72196892.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85d746854e0a47a5d9a156c1f975ca93a7a3d85c0476d56e3ee5b507622f0b12. Chain 2 (Bitcoin): anchored in block 958708 (2026-07-19T09:08:25Z), 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/QZES72196896.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3f09694b9412b8a1399619b8cd6a1e2eb01eaf56722860c3fda9e3825dd6d19. Chain 2 (Bitcoin): anchored in block 958746 (2026-07-19T15:36:35Z), 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/QZHNC2150292.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0cc144335119b8850ca3450953b91c338c84b47ec23503cf0f34646f78571bb1. Chain 2 (Bitcoin): anchored in block 958484 (2026-07-18T03:34:53Z), 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/QZHNC2150295.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x790b92d8758d0b161fd3c0b04f248ccfc8c4f2720dd9324b4bd4e78d40c91393. Chain 2 (Bitcoin): anchored in block 958703 (2026-07-19T08:36:12Z), 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/QZMEN2172400.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x299f3fb51bfd474c4ffd86977ef3cdb2eddee8e45e2a346b778554634b05321f. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QZMEN2172404.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfae245175ea9641feb1fa330dc7ced39e0697cdeae01f0b61dcbc13a3428e4c9. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/QZMEN2172405.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9dcf015e72faf557c6e37c8bcc3ede7af1989df5fa9c9130eac762ed46785af. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QZMEN2172411.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc44707977028cc73307a7c510e30c0416c423203aeb5d560233ed91f25d734ce. 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/QZFYZ2253971.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1cdaeb4bdbf07255bad16a4f51ade3372ea9556849f586e2b9484bcb1c6afd1d. 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/QZDA42233771.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe54fc681864c6e64a52e2f0e80ac6b71779fa152040ad95391d4b3daea6c090c. Chain 2 (Bitcoin): anchored in block 958911 (2026-07-20T16:46:31Z), 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/QZHNB2277524.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66bcd891aa928bf2a91c82b054bfcc6e581fe43b5c615f536f46a4fbe52edb16. 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/QZHNB2277526.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd4fbd4f5d5b4d569123a9cfd7427998ba3dfa6fafb7f83a4429ad5605a61706. Chain 2 (Bitcoin): anchored in block 958455 (2026-07-17T21:28:36Z), 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/QZHNB2277535.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d113249beab47523bcdbf36f25d66ab1cf6c9c3116172b07e0ddd8091e813f5. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/QZMEN2268883.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d7e65b2bb359abfc00792721371eeb30f82473a59f3294303557547c14fd1c1. Chain 2 (Bitcoin): anchored in block 959061 (2026-07-21T21:34:21Z), 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/QZNWV2283806.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d74a73c3054739d4354b60c83e7482c7ea13555e6b3f7bd11323753ee826290. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QZTAZ2271694.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6cdc19940ed12449bb87d33e5e2d2f52ce4b2561e5f5d3aa118b258ccb2661be. Chain 2 (Bitcoin): anchored in block 959073 (2026-07-21T23:25:37Z), 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/QZTAZ2271695.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd570479d1ef2de8d21d1d0bc8ee213ddddcbc6136492698709e71bf724a9e979. Chain 2 (Bitcoin): anchored in block 959107 (2026-07-22T07:19:23Z), 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/QZTAZ2271696.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c10860151c8cdeeb7c1a0e0dc30ea81190060edeeecccf3b190c26c66e5c22f. Chain 2 (Bitcoin): anchored in block 958774 (2026-07-19T20:03:27Z), 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/QZTAZ2271697.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09aca6b2407f465580b33f4291c96ad79fa6b8676d04ae5e0a7759518b702712. 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/QZNWX2253519.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0459582091a12402c923bb1d287d3aae2932a89a1afa97559f00aa898bd9cf1. Chain 2 (Bitcoin): anchored in block 959118 (2026-07-22T10:01:58Z), 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/QZTAZ2271700.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8807c7b701ad21f8c9d6f23a6ec4d6afa2fde54db564d4374ef2213def099b31. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/QZNWX2253520.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a88bf2cc566a3ff93710b73ba95b0381ed73bf1a172af6a0d78ca463eb4d5c2. 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/QZFZ42323506.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7800a9a18241eded20769b567d8324552fdc9361a6e141b3fb25ef53041b1543. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QZFZ42323508.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1725587441825224f90a7f5c5034563e10a15a30d0cb90e68154078bc2194bc3. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/QZHNB2302162.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x268bdc823c91068c844dd34548cef9eb555677fc4dd127a1371528415360f43e. Chain 2 (Bitcoin): anchored in block 958594 (2026-07-18T18:05:01Z), 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/QZWFN2453347.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b831b8899626d27ef6bf393176f157c81bef6a6f5fbf29673463a1f2dbdc7b1. Chain 2 (Bitcoin): anchored in block 958975 (2026-07-21T06:12:52Z), 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/QZMEM2594469.