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 0x03ecf632ec063081291364588897eae4ab761f9f96ea0811db813e15b09bea6a. Chain 2 (Bitcoin): anchored in block 953786 (2026-06-15T12:56:12Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d7b2ed1b-c394-4af3-bf66-6acfe78efb1d.json and https://artists.proofprofile.net/proofs/artist/d7b2ed1b-c394-4af3-bf66-6acfe78efb1d.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 0x046ea026dd67d0b5c959234f837eecafd33b596ca77409b34266e31e569e7c3d. 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/RUA1H2143419.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23b89f00bf07a674fa81dab4d743e474770ffeceef44b6d527e443f867d750b8. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/AEA0D2267952.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26a77e1b98bde475883c7dd4c8c2fa073ad2501765948c17cf2016b4b0da6d25. 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/AEA2W2314250.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f432dc47b60b42a2523f7c8a48872d97bfd22e3277c2df2d0e5c19cf91b6961. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T02:05:55Z), 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/AEA2W2314252.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11df254efd2d4ccec67cf2b9ab5686b3ea308b694d1aae3d4fcf3a4064bfcc55. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T02:05:55Z), 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/AEA2L2392505.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9b436f1c1034eeba7e069b25e9a88848eeb17f721c7a8df46178ae33fed21ce. Chain 2 (Bitcoin): anchored in block 959134 (2026-07-22T13:34:27Z), 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/AEA2L2392506.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9fe64eee20983d151eacff13a2096f881ca757b3752e781aed725cad52069a9. 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/AEA2L2392508.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28f50a552fdeac921f5bc77f43fe58d620d7d5271b67be6894560245502995e2. 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/AEA2M2490731.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc794842c46d3cbf4b7a54adf62394be5404379ff6e45a541701abe0b736e90a1. Chain 2 (Bitcoin): anchored in block 958783 (2026-07-19T21:20:45Z), 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/AEA2M2490732.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3d9c115970e0fe9c8041d9b1b44dea9b71dee0e7a016b5fb0b4fd38965bf421. Chain 2 (Bitcoin): anchored in block 958796 (2026-07-20T00:01:46Z), 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/AEA2M2490733.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7335d802146e5af3ddfa64f84f4141c657cff9052aec217d55adcbbadf6721e2. Chain 2 (Bitcoin): anchored in block 958792 (2026-07-19T22:55:52Z), 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/AEA2M2490734.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b8f36db8af1798d5cb7af710209573d0c09d1890eb864281b29b5bcd9791c63. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/AEA0Q2431631.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x873e11aa4ac66469c0d713653dcef81bb16771275f831528c450f0510b435fc4. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/AEA0Q2431633.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb95b95e1b077a39d86a7086fdefc5baf2c6994afce3804aa2930ad0be21219a6. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T02:01:41Z), 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/AEA0Q2431634.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6e6d91d0931fda601bf4f5050268deef99312b365ac7d213988719275f15e5c. Chain 2 (Bitcoin): anchored in block 959051 (2026-07-21T19:48:03Z), 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/AEA0Q2438728.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e6812e2d776b1eeba0943f025cf3169b561a6ff217a5dd0042e97703077fda5. Chain 2 (Bitcoin): anchored in block 959047 (2026-07-21T19:17:28Z), 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/AEA0Q2438733.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca1dfe6d22ccceb17e720531a79e0c8344ba7d2b9b552c22ab300ae066a40261. Chain 2 (Bitcoin): anchored in block 957851 (2026-07-13T11:26:33Z), 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/AEA2W2598680.