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 0xfb692f3374c7a3df6b6acb3f006b92a8e68e0ac8788b50cbda0ccbc7ee0b8265. 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/0155e3eb-bd51-47dd-ba4c-860fff75cbe4.json and https://artists.proofprofile.net/proofs/artist/0155e3eb-bd51-47dd-ba4c-860fff75cbe4.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 0x3a8848a6b373307982915de82f9ab7e061da3593de9a415ec7b5bf8021b8a6f4. 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/TCAAU1170717.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1bd58c4075a29eb99b2396146c3ff7934e3594762d0030e7ddc950ca8488295. 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/TCAAU1170734.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1fe33aedabdd1621e8167064ac9812740f53924ea4d48e330ff5025e70f70e94. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/TCAAU1170746.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x456cad20c5e767ad99e2c347c3db05355058f00bbfc1bfb02ab4ec2c2c56104f. Chain 2 (Bitcoin): anchored in block 959061 (2026-07-21T21:34:21Z), 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/TCAAU1170770.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x662651187f447dc82b537885d1c073d2a97d4a407e4260e1f5a3366390af1420. Chain 2 (Bitcoin): anchored in block 957747 (2026-07-12T19:35:06Z), 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/TCAAU1169538.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27bd3b026324dfb657394270e0e09441002fb21083586d51b7f9425740f919e4. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/TCAAU1187195.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10360a0503cdb90641a5fe925a7599736d79b6829c3dafd9d49a8a0258836116. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/TCABD1108943.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c09b66dbf735f59e98c90beea08044037ad3b6ee8534bbd5da9069116c9d521. 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/TCABD1108945.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4ff5b841af320f1663fe2eb3693d9849a0885dc6cca8d540e1feba5a7541b04. Chain 2 (Bitcoin): anchored in block 958722 (2026-07-19T11:03:50Z), 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/TCABD1108946.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec1cb51ed60d089dcdeeec02569d9add475c7d6133938d873c0eb15c0bfc38fb. 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/TCABD1108947.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6bb82672962973b09df0ad1edec5e27a3301b42a97aba5343089a7b71e6b1236. Chain 2 (Bitcoin): anchored in block 958955 (2026-07-21T03:03:40Z), 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/TCABD1108948.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c9ee8992ecf72d57d703625952c40ad33c8866d0423ad3eabe69951934a1b23. Chain 2 (Bitcoin): anchored in block 958731 (2026-07-19T12:35:36Z), 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/TCABD1108949.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8418ed1e2b2dfacd8030abfd02930d3ba8348bab24e51853bce3af134490335f. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/TCABD1108951.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x473f380b4a8ff05cbcbedd695a310fb947392d79fd043869ed398e9487884d83. Chain 2 (Bitcoin): anchored in block 958907 (2026-07-20T16:17:58Z), 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/TCABD1108953.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11fb51fe06e2537ff1b39e9d7de659e08f14c212377b69b80ec83e77738a0ce7. Chain 2 (Bitcoin): anchored in block 958805 (2026-07-20T02:22:58Z), 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/TCABD1108954.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeba6bc150099a0e4b99f6ecab4c640aa27194c754620b7e3a6190d2fb26b0922. Chain 2 (Bitcoin): anchored in block 958985 (2026-07-21T08:39:15Z), 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/TCACP1636894.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdff934ee95c5c289c1fcfdca7f838b540f7865a3223a4bee042f25fa77f38983. Chain 2 (Bitcoin): anchored in block 958163 (2026-07-15T14:38:07Z), 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/TCACP1636908.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65bfe5cae515266460dc65e276f92f59bd530c6161459bbcc303e6aebbe77f2b. Chain 2 (Bitcoin): anchored in block 958969 (2026-07-21T04:58:13Z), 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/TCACP1636923.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e52c6a18ccfdf2d432c14b8beac5709dc1052eaeea8bfc2feed5176fe63932b. 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/TCACP1637048.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec26173a75b1e13875fa82fce45eab102570671a39224e67c7e3a3fdd1a83821. Chain 2 (Bitcoin): anchored in block 958770 (2026-07-19T19:26:13Z), 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/TCACP1637161.