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 0xc753748cce4e74325d484ea86ebffa6cde5327d44ea8dd0df0ab640807feeef5. 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/fe130b63-fe78-4f97-962d-a72dd3077b4e.json and https://artists.proofprofile.net/proofs/artist/fe130b63-fe78-4f97-962d-a72dd3077b4e.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 0xc6d91d475df10ca598ef144ce14ecca9d18e039d59575fda678e9480a935fad4. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/USA2P2342421.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ce35a6d6d0f936870d08cc4ab77d801478a62f752ef1ea2f2d75d4070fdae1a. 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/USA2P2342422.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb6c5d6bd13434fa62166760c870dc4c7926a17ab2a3e8202ee4d90b2a0d40eb. 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/USA2P2342424.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b7be2f9ea8296fbae7ce570314e7f37c5ae6b3f78824ebc1a2b6c96a19b293c. 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/USA2P2342425.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a1a5b7cafe49274494b71e113d07b60fb0716e8a1da3a35effe001b3ce086e5. 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/USA2P2416345.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5798584db22707d95e2ac195e4252062eafbe7792e7fc101249500218359e0e1. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/USA2P2416931.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0528f9e35424d9956924df1d133bea738c38ba4cd03abd91e7375b09a5b6b634. 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/USA2P2416932.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1153652a5366cf6e0fb0a09f4725a5461a615f21cdf76cef19ebfa2e14ceedae. 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/USA2P2416933.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7bec16bc96e04a5f7249cb60deb072cd2bba603a1be2b9f11bdef2785d5379f. 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/USA2P2416934.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a1a5b7cafe49274494b71e113d07b60fb0716e8a1da3a35effe001b3ce086e5. 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/USA2P2416345.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7678303c2f23fbbb79e12bbaf3f8bedce620cd0e22bf08d313fde182a71ea47d. 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/DGA062204821.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfed520c3a80b818663fe0a8ea329758dd414fc9a2efae1a99fc636fb659e5e8d. 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/USA2P2314290.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec330be9550619adbc30c4cb441c31cd752195245fbdc2c42009bd5dbe5cc0bf. 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/USA2P2309244.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfcc1ae73682fd7314a0093dd2f37784eb25fbe840ee2af16160e3d92bb0a1115. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/FR96X2286674.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x006b48af71ce517e9372fad5854eb0f2985a541f44f72d47795fbf0a1608079a. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/USA2P2209255.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd811eb5ad19654f5b762ec76668b5103d3ee84a3cc50f6fe8db2ea03439eabe. 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/FR2X42210975.