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 0x70e85b7301235a287323fd6fc5f28bf7a2439838557cac566ab37297cef05797. Chain 2 (Bitcoin): anchored in block 954580 (2026-06-20T17:48:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/b7f335e0-1895-4026-a304-bc6bd20669e4.json and https://artists.proofprofile.net/proofs/artist/b7f335e0-1895-4026-a304-bc6bd20669e4.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 0x4e4bc036a84d705fa18a73a70bd233348e97e91377341421cf6912b5a2fc5718. 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/NLCK42219010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2285cf15c347b013160c6f48cf85a00732d75dfcfc720a401727fe3ad8a50829. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/NLCK42219011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0eaba18d031cdc87a6af9c69b3eb6e3df2a4b8e6ebc0e735baace7f34d08fca0. 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/NLCK42219012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf6fd797e0009fee657687a81df4ee420fcc4edcba966c6b399d3cdea37f6945. 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/DEPI82115362.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe32891c4a32911de26b54a622dacd33d2abce7c1424ca53120cce8e309f1b84f. 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/DEPI82115366.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b374ce3e955a5233e30b75451e805c25afba7dadd6ebf06cb23f5ace0c2ae52. 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/DEPI82115354.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49ddfdde0f86b606dc92a99d5e168eaa09aef921aaa978e6d035f17bbef08973. 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/DEPI82115355.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f26412fc82c8a033a5c6c33153b6b12148595d057c8d54c998964c6fecd9eee. 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/DEPI82115359.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc19ae2dccc82314156e0e986b11745baaea0fbaf815dc5ce9e87dcca9091ce7d. Chain 2 (Bitcoin): anchored in block 960340 (2026-07-31T03:15:04Z), 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/DEPI82115357.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf69984d38fbef9f0630a9b7b44a7402b6230d1435c4975b6dfb07d749565ab8a. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/DEPI82115371.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac383de619c328437bde7c18398e7aeafc303837e7f78e90bc44ef8626533220. 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/DEPI82115360.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd0af656c3f4579e8845e5e2e86c4eb58bb272b3990314f8e9160960982fe422. 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/DEPI82115365.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf41112870058f1dbabf02d8585ab215a4e0eceeeb76c3433bf70d0473fa74ee5. 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/DEPI82115369.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa027b5a6706835b60a238572b56f2bb909bf03489299a65f672325de01cc75f6. 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/DEPI82115367.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80be95547eddbb46fa000ae53b73f84849253ea3d85322d03242df0f334a50ee. 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/DEPI82115364.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc33bec0112f45c35e339f5a46f08f0dc813203cb8008527111447b2307efcbee. 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/DEPI82115363.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23abe3d167a66e0b16322525fabcfc948a57795c0438dc3672d670095c2c6062. 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/DEPI82115368.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30500b9a29e1c22131896eb6e08206538cfab90c68050fb3c75c31d346394c96. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), 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/DEPI82115370.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc215070f33678250ac17921fcf646acb3163e3726b25fbf3ac61e2a4b10daf2c. 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/DEPI82115361.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x169a6abc559ea8fde6c5368433fa0614070e7356b4e38b689653a91430f2f5ee. Chain 2 (Bitcoin): anchored in block 960250 (2026-07-30T11:13:28Z), 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/DEPI82115387.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e40dec62c10e5fa1d97628048c384d7d300bf4b7719e937905c34de757fc050. 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/CH6542345165.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87e1b49b9e37d782945f5b87035915b59e3f7e781abf5e4198b0406bea4e7dbd. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/NLCK41086838.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62b062814308fa547c5a1460636fbf3f9de624153e9825243ea15dda7b4c9993. 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/CH6542124770.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82690af35d124ab8ff0d865c68c6502e704929bc1cefaeb9143c543ce1724a11. 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/CH6542124792.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5950d9e380bff5bc4a00b7564d21d3a2c151fae27856dea619b26a264aebc4e. Chain 2 (Bitcoin): anchored in block 960485 (2026-08-01T00:10:46Z), 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/DEPI82221791.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d3d016d512db44f90802263e00431dac6407a54a351cfdd5d5de0c12ca7bfec. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/DEPI82221790.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1606ee2abc1ad89ab0a8e3878864eaafc9569c0950580e58a86d3463b5f3a7b. 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/DEPI82309797.