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 0x3bc0879a5e5011aba2f23fc4ec951e865530c7622868eadad2c3172bc6ec7c6c. 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/77fd7ee9-9a70-41e9-b0c4-16e42a783c09.json and https://artists.proofprofile.net/proofs/artist/77fd7ee9-9a70-41e9-b0c4-16e42a783c09.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 0x13876a8fb06b1ee0093515fca011f5d4d51c5e931145a022f66c19b99935fdb9. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/HKG732384619.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c1580ea06708783ebfbb014189c7e4d0caaad1a3aa59b696bf61f943ddc00f5. 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/HKG732358424.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb35c878167e14dde876091fb85fdc03e78f2ea05d074bc6d3df23cce9fbdf123. Chain 2 (Bitcoin): anchored in block 960435 (2026-07-31T16:33:26Z), 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/HKG732358425.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x571022a2e3d2cc6b675fb2b2cb421bc7e2a421c803264d8f4aa646a7f1f44748. 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/HKG731686354.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe807cc23a4e342c80d4d55d19bc2683475f27e202770b707b009a71bce8963f5. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/CNZ632201560.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ca2efb7974c1e3b69de6a6d6a3f5ff4a12b1c62ef2e0003f688f76c291f3085. 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/HKG732464961.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd44575fb30fc120a186a50067d3a08305137926e3a53294a215748a6e15d8cdb. 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/HKG732465107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15d916b34cf350f8b39a5fed54c0ffd1360ca0733adeb2b04c42dc88732d09b3. 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/HKG732434002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe806ad297de4f27ed935fca10da71457b69b4cc4c1bb101849b7745a01ebc2a. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/HKE672400823.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35371826be295a40c570d94d34bf6c3a07a49bd6dc2887ed2cc1699fb636832c. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/HKG732428160.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4279961651b5776d2eb02dc099ab16f89f2d7e28e22b34c9d9c865783da6cbb0. 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/HKG732410178.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb04ec254a6e0b261be005f84a9cbf7a732a368b84e8123fd1876930267205c86. 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/HKG732410061.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00ba156a1d83b8cb6b228d76a7923e0c6c15017e4a585a076bfdfbfde7c28fbe. 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/HKG732423253.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa183a10b87bac7c3e60e7a9105205988bed7a2251c3fda596f2104e744adc3a0. 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/HKG732426539.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd380da202bb67f2084d040fa227014de9f4fff5959e5788f5146472f90e36ed6. Chain 2 (Bitcoin): anchored in block 960410 (2026-07-31T13:50:38Z), 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/HKG731661253.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf16632afe0663eb8f63bcb5713c13d3ada5e3761ac8811d846141ca3f8ff03d4. Chain 2 (Bitcoin): anchored in block 959118 (2026-07-22T10:01:58Z), 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/CNZ632300287.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d1103c7b004b8a745286efec2c4d6adef0c3575d4e3f52488bf45b3baabe6b4. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/HKG732331590.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41df627f1bbcc7ce52f3e50e77d6e7f3ffa7368b39be1b5a03235d179dc7e1f9. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/CNZ632300321.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46c8ab5fc8124c9ff7a76e447ab35ba2ae1f9b4729e3713fa4003fbd986850e9. 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/CNZ782300040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x271da042581ee3eb7fa83c7c79eea1485cbe48e173b4186578ec964f5671ff3c. 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/HKG732288427.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0713eff4f590a610ae1217bb55a27cfc8ced66273b43650c319f29d138f71e63. Chain 2 (Bitcoin): anchored in block 960337 (2026-07-31T02:51:48Z), 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/HKG732285848.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c4467f206cf2b9f7bd96157eefd15cddb86e2cd8f533b085c65d95cef060fc9. 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/HKG732281116.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee132bed7812acab289de887cf07fc85bce94c9258aaa881bba9559df5a55439. 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/HKG732276925.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb6a1d377897ee2bcd762dd322b333f45d1a16f386c634f1be82f55747d5cec9. 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/HKG732276141.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9fb5a61abfa2ab9518e0ead58eb5ad00aa69e1693f7766dad7a11a1ad6aa4311. Chain 2 (Bitcoin): anchored in block 960105 (2026-07-29T12:35:17Z), 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/HKG732274414.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0cba5dc7e7c3aa14929e789a6e205193d4f5d989326cdbb18fde3fed6dc5b06d. 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/HKG732272039.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5353140ef62b92862f3f42f703c6110685b8360f2c1b118150cfa221213011a7. 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/HKG732270286.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa844429c7268964bbfa83945a4d0a05b1af384f7754710d5c0db1df8f14c8270. Chain 2 (Bitcoin): anchored in block 960337 (2026-07-31T02:51:48Z), 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/HKG732263378.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa892684c43f174f8e63cd66fbeb123680710612829a995a981140723ee1f4ef6. 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/HKG732315388.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x365c6bf8cfb33400f33c4842794ac693fa022cb545c0e76f1e7ef664bb6e0423. 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/HKG732261818.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6115ce552c04d7aa3d4c24fb910c5dc1c3b19f4739f7b7b908f7425ee9ff078f. 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/HKG732313063.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa604a8fbe72d7e38e4a4df1952eddf3e7a9dea32fc724f9e0366eea744fbde07. 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/HKG732229221.