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 0x82d4d7e5b870eea7c134f963bf1bebd034e8a45c58b7146d760f202969a3f2cb. Chain 2 (Bitcoin): anchored in block 953670 (2026-06-14T18:07:12Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/5915a791-8c10-4faa-a370-166566e93b79.json and https://artists.proofprofile.net/proofs/artist/5915a791-8c10-4faa-a370-166566e93b79.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 0x1a67d33ab4c0b467111337de260bc975c7e5fd1d3dc5be1e0a26936213db9b4c. 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/QZZ972444661.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x376bbc56677d4a28d8dc9bf17e0b33fabaa259116ee012c9a1c4acfb995da5b5. Chain 2 (Bitcoin): anchored in block 959137 (2026-07-22T16:44:21Z), 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/QZTPX2356409.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2e26922092116700b271863b676634b15f780e151b56936082307b5b455a8a7. 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/QZTPX2356410.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a321dc0364f30fe5866521bd0487b6abe164183c49f0959e0e364498d78fb07. 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/QZNJY2366604.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30d45f74d9d1f07c52f41fa6fd53cba453a8e0f9b65152950ec48fb83091b1bc. 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/QZTPX2356411.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeccb1c5db85a9c2864dd78e0ce416d5bf381a37917a5a94aee5cf602c7e7e1fb. 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/QZTPX2356412.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x871105cbf8abe35b24a335531efc0655b957ebdea0a7f5b78ed67f86b2ce6d7e. Chain 2 (Bitcoin): anchored in block 959132 (2026-07-22T13:20:46Z), 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/QZTPX2356413.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ebeeac886a8cdc9aab953afa3bb32031b4a4d3b3f2247e41247ea9bd92fc5ad. 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/QZTPX2356414.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9aae9d6ee1c87c2baa080708711e39cdea19e5eac1e6a29af0dc5c0e555b0d45. 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/QZTPX2356415.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8335e446e4d395e3f42bb9003d46fc85fea330f9721252eede13173cf5e54fea. 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/QZTPX2356416.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe1fd4b2699e2fd5c6851ee3c62b7ab5eecd983edc8a7e13302958e2a0f91cb8. 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/QZTPX2356418.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3bb95fc24319f86f6393c7812ef2bdefd6a8474d15ed49188c6539164be07639. 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/QZNJZ2355410.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x490b650c6a1bdf3d638ade6bfa5084ac89e45b472b3c90414cfa9582da05957b. 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/QZTPX2356420.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfef939707f3acf79d8ce4465a5f5ff6b232db6f259ced665f7c01a2de19ae81a. 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/QZTPX2356424.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe71f7c1e8827e1da0b1a5a67b8a1cbee4c7aaf2585b193af07161d0a58ad0f0e. 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/QZTPX2356425.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e664ffe394b71dc01064b7cf4fb6162bff9bfc36d9ae0fc095059937b030591. 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/SE6HN2474965.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e1ccb295cc819eeb0109183b40bb8766fd5e0fc7ff2ed4a76a6fe1c64d21869. 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/QZNJZ2362192.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdbf533639410610a7fd72b56e8ee64fd4927181070b92842bf81358be6959aba. 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/QZNJZ2362193.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x523175c9dddf9e0a7a81b26914b07f20cd2d4c7b3520c427867776726d4dc46a. 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/QZNJZ2362194.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x914676c5168293cd572f2e409dbe36fd3c853e64c80ba98b10dd3347723e6cb9. 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/QZNJZ2362196.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x937cb7470450eb40409a7d03d732389bfb5db64d6d9a61e89a5be2f9ecfe0a85. 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/QZNJZ2362197.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58ec32346cf7127df39be672864f39b673c2ae6795e16828a909eb1fe586d544. 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/QZNJZ2342015.