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 0xcf765f03ff9d36e01217fa252ac7006a912edb7772dd580077886094f34811a6. Chain 2 (Bitcoin): anchored in block 954603 (2026-06-20T21:47:54Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/c2cbf864-8a17-4a19-8fe3-885a886bc53c.json and https://artists.proofprofile.net/proofs/artist/c2cbf864-8a17-4a19-8fe3-885a886bc53c.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 0x77411f02321827d47fd33e265e7e49b5717b009efa6c499759f2e6079984a95b. 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/FR9W11621266.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad1658f5f8a9c2304a623dc568ab307800548802e94cc1b449ada576800bee9a. 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/FR9W11621267.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e3dc1f675dc9379231a0a820778fc76d1e23d02f2354a6adcbbb6c891162cb4. 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/FR9W11621268.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40450bb1d4a1464d45d741b66326b8f99f7aefb477f3e029eaa283f11450420b. 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/FR9W11621269.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbaa1144b88890070662151d14873181834aa82f40f3490270b5239bf6dde931b. Chain 2 (Bitcoin): anchored in block 960229 (2026-07-30T08:30:10Z), 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/FR9W12116972.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde659012baea19e54cb5f5dec4e8440b788217d203d7c63e76888e3467fcc419. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/FR9W12108823.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf59c9347afefea0c95094938b142b389690acb73fd6055ab99ca0517f18269d. 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/FR9W12116973.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68faf8f6db4f687d876f8356572c40076ad7f46fb416511d469eb62bbc509337. 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/FR9W12129334.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1a7a44701755b02df76c8b790ba7068c78f34827c467aef0116db4e317c00d0. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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/FR9W12116975.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab48f11847cc9a4125de8ba048bece4ddbcb974c55c018ec9aa37ccf81263950. Chain 2 (Bitcoin): anchored in block 960167 (2026-07-29T23:42:34Z), 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/FR9W12116976.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12eb6d6ef49f620ec25f330b9888072fe2af5319436230946e0ffcf2a253f560. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/FR9W12116977.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd89359453fbd70bd5f5385fbc6c899a1756073887b4eb5e46e4c8e5949b71671. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/FR9W12116978.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d5428d849f2169e79450109f10c0b72edb9ea87db2ae1703b5a3a026fa2c761. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/FR9W12116979.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xabe0b186c9254b3a8418cb0df055e1f130f3c1be1dac556261b935f45705dd32. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/FR9W12116980.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef658d18b042da6544a92ff58edaf6a53ef6e6ca60b96034f058a1a850c4fc47. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/FR9W12116981.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73ff9d05ed80a6703ab4dde50a50af7b14dfb562d7b14f754c1b139c9b25991c. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/FR9W12116982.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef658d18b042da6544a92ff58edaf6a53ef6e6ca60b96034f058a1a850c4fc47. Chain 2 (Bitcoin): anchored in block 960163 (2026-07-29T23:20:38Z), 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/FR9W12116981.