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 0x5f128389f7a48c46e33b5cc44c9e893e5039970e60b7bb8270556373e7146fbe. 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/8a8b091b-0e3a-40ba-9226-435dce0607e4.json and https://artists.proofprofile.net/proofs/artist/8a8b091b-0e3a-40ba-9226-435dce0607e4.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 0x3d1321976dbfca6e0c55449a4be827e3934c8a6ab638b678ff59a78dfe765da8. 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/QZZ7S2502123.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89e4ed60b9e42941ae44af95b3fd39bfaf46882aca88f6e374b14bcf07ab7ae7. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/QZZ7R2599605.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8871863facbc00b30c721fe312d29ad02f92cc02c1e8be68438ac7cf5fbaab7. Chain 2 (Bitcoin): anchored in block 958846 (2026-07-20T08:14:15Z), 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/QZZ7S2526537.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72c0a611d13f7ebd36a4fb95a822f82067bdd2d54b01c51877946c2cb2f02ae9. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/QZZ7S2526552.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d07f1694e9dd684ccbfac55ab8028b805f66a6136b63e9dde5d2033a6366f43. 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/QZZ7S2577260.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1acd59f1ab958146227622e813d3fd1c3de2b061fe15268f61a00c12260bf17f. Chain 2 (Bitcoin): anchored in block 958238 (2026-07-16T04:30:31Z), 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/QZHN62384513.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x740e9ccdde224382ceb7894fd54354e3e8fe8a84c4e777bebbfde9b9afaf3d39. Chain 2 (Bitcoin): anchored in block 957785 (2026-07-13T01:55:31Z), 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/QZZ7S2578835.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84a237b7ea50d9bb103ead330c8204f9bc9ae7bd257c134cbf53d0f5e76894c7. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/QZZ7S2578834.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea788cb80e3c659c10c5a3351b1b348d48d217f859c8327f1607db977fd57d59. Chain 2 (Bitcoin): anchored in block 959107 (2026-07-22T07:19:23Z), 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/QZZ7S2517653.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7709307653c45904628f0fe0cb58b1ccc76a8da1653a743158ce0c1d30ae7c1. 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/QZZ7T2501791.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad7a0e8db3cd9ae59622cf0d2395a427fd16b6cf9e0c751b78ffd299d53f1df2. 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/QZZ7T2501801.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x759e5710951fb2f99dcc8f85be8ac1e3faf8ad053612b9c0539f892f4807d11e. Chain 2 (Bitcoin): anchored in block 958476 (2026-07-18T01:26:56Z), 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/QZTB42441099.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe783b0134a16c971e96278aad77651380f48bc6944c072cfd1e97d4882143e7e. 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/QZZ7S2533705.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8567ed725d299caac21ddfad39b2cc2732d7dff8c90366820156b3c503e5c55. 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/QZZ7S2554943.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0714091c71a7d8b809033e58720a9ee96af730d76f781e5b1b02a267837573a8. 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/QZZ7S2574173.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb136385dbe31b9b5d84b5c91796d32eabc71dd7f726b9ab12e125d470fa33335. Chain 2 (Bitcoin): anchored in block 957788 (2026-07-13T02:37:37Z), 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/QZZ7T2508211.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x349a7518aa020229643ff2264bdeeee3e41467992d3a6912312e555fc0e80aa3. Chain 2 (Bitcoin): anchored in block 959132 (2026-07-22T13:20:46Z), 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/QZZ7T2515677.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7825ecc06ea6fdec72c54c8d4b36942b9f134284a38e34757bbcf740275d78ea. 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/QZZ7T2515681.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe31270929a8bd7d1856830c12f22d6e6c154d6ec37246d1266ba61028d18660d. Chain 2 (Bitcoin): anchored in block 957785 (2026-07-13T01:55:31Z), 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/QZZ7T2515688.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b79e1fa86220051b1772ee2b69dca5724f3d3d803954ac394fef3732b1a651b. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/QZZ7T2515685.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2c00f50348643270aa2310163d0fcfbb17cf71f7c354be154654664fdae4de0. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), 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/QZZ7T2523181.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x750df906f1f1d3d353173510025ed05143a2724ded51456d7e3f85ad2a01831c. Chain 2 (Bitcoin): anchored in block 957658 (2026-07-12T05:03:28Z), 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/QZGLS2520901.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62e97adfff7fa4a315896c32010cebdb5d4add59b45613569db77d08e0b10665. Chain 2 (Bitcoin): anchored in block 958543 (2026-07-18T11:58:44Z), 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/QZGLS2520889.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2420e5c091c4a4c4c5fc63229bafb6ccd34f318721443863ae4168721cbdf87. 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/QZGLS2520887.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94e3330a028b60e435cfa0d9fe8fa46614061f0cfb4aa1aa0b486520f8b25bb0. Chain 2 (Bitcoin): anchored in block 957671 (2026-07-12T07:35:31Z), 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/QZGLS2520882.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59a511310a3ce8d452a7a172af5ff78e3f02b01c975664f3630f237efc4bcbcc. Chain 2 (Bitcoin): anchored in block 957653 (2026-07-12T04:35:02Z), 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/QZGLS2520854.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7c514863fc6130d148d061fe56cd4b19e04427c7b81a8c6eae76f1e3c962ce2. 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/QZGLS2529165.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35c278cd78964a02fc9c92cc4795ef1837eaf7754a13cae0ef67d5713341b317. Chain 2 (Bitcoin): anchored in block 958489 (2026-07-18T04:13:26Z), 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/QZWFW2543644.