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 0x015f24090b46e9236d4ec61ab52d1271a42ccc8541c44eab32c0e41dc9d430ae. Chain 2 (Bitcoin): anchored in block 953750 (2026-06-15T06:12:23Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/ac4175e2-7889-4fcb-a4bf-301ddaa6e97c.json and https://artists.proofprofile.net/proofs/artist/ac4175e2-7889-4fcb-a4bf-301ddaa6e97c.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 0x396da99da4a53810fe322df77a5b9fb5b0241197f6d244039937ca9cac2dda46. 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/BX9DA2000039.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa80000018d24c1b0c0b203cfc5d7f0017126df90871350a18ea6ce665787e1ca. 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/BX9DA2000040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x001d5f820db785ed4fb01c46aaadc64d2611f92b9720dc0062e46486e419c0c3. 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/BX9DA2000029.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2edba338cb140b53e309a449def1626ed9ae5750cf8a0aeb34336a929fb49f9. Chain 2 (Bitcoin): anchored in block 957032 (2026-07-07T11:43:09Z), 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/BX9DA2000041.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb1ada545857094a54d925f49eddae80286a01f7517da6d85539b81628cd5c2b. Chain 2 (Bitcoin): anchored in block 960095 (2026-07-29T11:07:37Z), 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/BX9DA2000042.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15b585c441e9c7416ce4cb77451ad84f3a032a4da5abeb598857b27bbb7ef3ae. 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/BX9DA2000043.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x187bcb6d08ac660cdb58c185ef61c8d544df84fcd9ae4de56b42487a5a0e8abe. Chain 2 (Bitcoin): anchored in block 957061 (2026-07-07T16:07:00Z), 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/BX9DA2000044.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f3c9009d9b09c168c90937d5ae3777c1887abed1bc98726930a1f5021f35f38. Chain 2 (Bitcoin): anchored in block 960125 (2026-07-29T15:38:18Z), 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/BX9DA2000045.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e20510e86e2653970bebae46ba92cbad5d49ed5c44be63fbd259ace233a3fb1. 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/BX9DA2000046.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x234eef8fad4660c90525ad0c9f69b8547188d03eaa8bad05c11cf7c125195d6b. Chain 2 (Bitcoin): anchored in block 957050 (2026-07-07T14:41:13Z), 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/BX9DA2000047.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xffa3c4f779b32bd520a341f060239e315a7c4ef11d702fdb19d9dbc6edf99e83. 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/BX9DA2000048.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd346a37fba4dc13ff1af8e5dd911583a67fdcb9a656e885b37c42d7c8dd1e1e0. Chain 2 (Bitcoin): anchored in block 959094 (2026-07-22T03:33:16Z), 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/BCT6W2500001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88882dfe07c9dcb1ad2221438f48752bc125bdba193b7f3cab3dc7cd0fc63a4c. 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/BCT6W2500002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6b1089f28704c81232dd2e4d22ef5ca5f4c6c763445ff687dd77c401025bfb8. Chain 2 (Bitcoin): anchored in block 958111 (2026-07-15T06:58:20Z), 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/GXBAV2019410.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6b1089f28704c81232dd2e4d22ef5ca5f4c6c763445ff687dd77c401025bfb8. Chain 2 (Bitcoin): anchored in block 958383 (2026-07-17T08:20:01Z), 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/GXBAV2019410.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf8c632238650796ce6c6d9ed29347f63d2005bd7d1a62b95f4cb08c6d5babd3. Chain 2 (Bitcoin): anchored in block 958256 (2026-07-16T07:22:18Z), 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/BCT6W2500004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe36b4d3dc534436857fdd6416711caf1dff3f9e3b42f2f71484ae6c154c67265. Chain 2 (Bitcoin): anchored in block 958202 (2026-07-15T21:23:21Z), 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/BCT6W2500005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd847eef509be73ed59b51b48347c667f56aacb693434cbed79d10dd783c00cbe. 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/BCYLD2200033.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5ec900bd49a374b925ca6bcaaae05380dc7157f0d258f207b8e0c52eab6c7c7. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/BCYLD2100014.