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 0xc7d60c58a15705beed29e0daea8225526249ece0f4df874d3b18b41eb845fe38. 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/a27d0c1d-221a-4ea1-8192-2146cb148844.json and https://artists.proofprofile.net/proofs/artist/a27d0c1d-221a-4ea1-8192-2146cb148844.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 0x97a448d0ad586e01843eccb8ed32717c3172e90080be6c37b618e2a6ab2da08b. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/US7VG1757049.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x341f8bf415d46d81ab4387ead7a31212aa406c5d97af62f71b6ceb8ab035db58. Chain 2 (Bitcoin): anchored in block 958596 (2026-07-18T18:42:38Z), 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/QZ5AB1908401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0970c41dd813129d1c099ac7bad87fb0f0a68698b518f37d7bebf029f5fd047. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/QZ5AB1908402.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1798645fb2eca65e9064dc9a2e0eb3523a032e9429c887a455742e663f59d7c3. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QZ5AB1914030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69229ee684453f03d8d45cc979751f51b1421f1452ef85d0b9a66458051bf872. Chain 2 (Bitcoin): anchored in block 958211 (2026-07-15T23:24:33Z), 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/QZ5AB1914033.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1a44d0b3b452ada86df081509b9cbaf620e926d5c1f0b548ef71fa809f1fc8d. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/QZ5AB1914034.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb44190634321b2a98778a3b5f067b014da12796751bf67bc10f56a97abc15364. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T10:20:17Z), 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/QZ5AB1914035.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb74e8356447cc05e7d4ff386a4db9520e1cce2efaedbdabc2ec7e17ef9eb57bc. Chain 2 (Bitcoin): anchored in block 958514 (2026-07-18T06:54:37Z), 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/QZ5AB1914036.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x058540d2eb91503335001066263910d80d30c92e715bfdec74c8ddea99f899d2. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZ5AB1914042.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7d762cbdd4b5b03c2fd61fd54d3f7b0f1a11f5fa3539c16693c8f4319a283de. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QZ5AB1914045.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfeafb91514890e06bf2125467ead0bda9ecf3c5db086a0d2b075f60474eaa0bb. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZ5AB1914046.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95727715d45ac863704f941697d083914f171f17db3f08172ce7be7c16e674c2. Chain 2 (Bitcoin): anchored in block 958631 (2026-07-19T00:50:09Z), 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/BX0991900022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xabd605c3ced951f2773542c3c811771299bcc876b38ba20e51a092e4ed2b204a. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/US3DF2217033.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf405ec472f1b4b46199ef2362818a71bd77f017bab28adcdadfc1350a679847. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/US3DF2217038.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa03f390d269ce47bb94291cf56709cfe2db9681bfc77f7db9d3e8945b3cbaa43. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/USANG2253998.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x120ba677cce958bc79b0c0d349923351d63c9cac580720a5f39c8879883ec9fc. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/US3DF2249061.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a9e744ccce6f94aa48603f8592740e94e8cde491b356ff9d4fd6bd37353ffe1. Chain 2 (Bitcoin): anchored in block 958728 (2026-07-19T12:24:55Z), 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/QZTPX2439946.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x534c721d429c201947cc9a89a4ef9035c3f7639093419717023ffb3706c4ee5e. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/QZNJV2559813.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e9910c076c6de4d6d3e8fef2d5eb9295ddeaf09b3652a5c8b52c150a237cec0. Chain 2 (Bitcoin): anchored in block 959155 (2026-07-22T16:43:41Z), 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/QZNJV2559816.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xecb992b3923612430024a288f25ff4d08b69510eb3a6c8c73416028f1f943d1c. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/QZTPX2596467.