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 0xce473871f1bac51c9e445ded271f77a1298b1c28c580a3a75641f3b29cfea0e2. 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/b9a51178-a07d-4ae9-8d96-01a2711caf51.json and https://artists.proofprofile.net/proofs/artist/b9a51178-a07d-4ae9-8d96-01a2711caf51.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 0xe9fed9a6a5128a1dc92c4a11898894acf92403dbc504a5e0fd354a3a4c8825d9. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T13:14:32Z), 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/TCABL1232295.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x798454312fdba5e71997c14a73092401935a1329e0ad75a68c695c30259a2f18. Chain 2 (Bitcoin): anchored in block 957644 (2026-07-12T03:18:52Z), 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/TCABL1232296.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74059ebb11a543b0f94a3f9705d8d30f2eb6b8d78883c64ce2d191aa999b6afe. Chain 2 (Bitcoin): anchored in block 958058 (2026-07-14T20:20:34Z), 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/TCABL1232298.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f2e89a8d462b6000d51f70c33cce7406d1ccc545893ff8f9fd6d50a3d258b13. 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/TCABL1232300.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0c8ca32a3c3d8f5a4436ef2e57c82d3508f05ebdfa973d659e36a5a6f77b2bb. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/TCABL1232303.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f95c313b71a2aead9a2c0dcdf962249d47f0c0313578cd59b13886993f5be94. 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/TCABL1232304.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x164e3ec2f2e496e6ed54e00aa37c4e6461134c01b2c8ebf462b9d2c2100e8417. 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/TCADB1712228.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x204214a5ffc758038f25adec2eb96fa550ffdc4555552c2ff40bec3c2e411b11. 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/TCADB1712233.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa9199bfa9eb1d7e6efc8dd1b0be06758ce1f4269938610facb6ba23a92eaa2e. 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/TCADB1712234.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f4e413a22f7a8c1c106a89f852de015e300644b9ff6f44bacdf43898102acb9. 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/TCADB1712235.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4392ca73f1b0f9ea1816a9da6b41e131e5d6b9300201e009befb1b8bf358229d. 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/TCADB1712237.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7b5e60f8daec8aad6659f78ac1da59387a3606fb16309d85c86645172558d18. 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/TCADB1712238.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdef87bcf4ce2016a31d168c2491d7d871a36e56b3ff00e4872674b593f90a83d. 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/TCADB1712240.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc09a6267ad959cb760cc2285319f2911ee3385d0722a3d450ffbe916dd7faa3e. 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/TCADB1712241.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63b216eab86d025113b667b0d3adfc1477c724d530936460b06ebec7130aa0a7. 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/TCADB1712242.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e03926837b242667dc819f8e41e31ac7eb25f38510d90556b5581fef43f7ada. 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/TCADB1712243.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x158f9dd5d3bfbbc3b244124b27dcb2616b175c72b15de448d7a8054ae8c4f6e7. 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/TCADB1712245.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f48d34310f1c1e6280fed7aa5ece173bcf014103fe6c7f68d57baf30e2613d3. 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/TCABS1329757.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2be4b8a256d1f1bb1da60713819ea76da2ac379cbbac3710ee24d5248b07f78a. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/ATN262087802.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26e29a0f02a0c5409b17847ad3df9a7ca5aee150140eadce2d4c2f05d63aecfd. 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/ATN262324901.