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 0xedb77a6f9207a3c9383e1bafa8dda2e44ba4699f716a6fc24d9745ecaf90d327. Chain 2 (Bitcoin): anchored in block 953889 (2026-06-16T04:57:45Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/0e503e8d-f198-4be2-90ca-392ba809b39b.json and https://artists.proofprofile.net/proofs/artist/0e503e8d-f198-4be2-90ca-392ba809b39b.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 0xdf6bf84e9205e8e91030f52795b3890818d0d7b50a1648dfe4886ef16f65b452. 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/CZA040525101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ebb37f8598abbc29e8d9d392e1ee153cb9f03f6c4e3335ef0a8acc40426b8b4. 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/CZA040525102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4899fc9e4a2e6fd19d562e2caa6b1d0636457ab64ba5a99cf03e2ce403e0e9e8. 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/CZA040525103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78d4728a92c1b0a2cbbc87c2b5ca811457e12dea91f041c172833fd6dec3bb2d. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/CZA040525104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f5f95aa47fa8606408d2b8aa835ec860a62b5fc8efd670ad48bc733b2ee5423. 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/CZA040525105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2501b8a1b3671e1eb398e823d9a239a90004511bf948eecb06423658a2fe82da. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/CZA040525106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8449f7635543a59f586cde051379e2b66c7c5c842c6aee50e5a8997a111f1c26. Chain 2 (Bitcoin): anchored in block 960506 (2026-08-01T03:50:58Z), 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/CZA040525107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e19ea8c24845d7f47aca6fa8a674d80919882d697bc2200610939b2450d4a92. 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/CZA040525108.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd93033b800f1fa04fdffa673c130fa4c99c2ab9fa0a634b477ae7f39e890e1fe. Chain 2 (Bitcoin): anchored in block 960389 (2026-07-31T10:20:10Z), 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/CZA040525109.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8a08a455962362b87a3e330cb0d8220d56cd55ceb7e013c200f0f730c871225. 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/CZA040525110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85a89f0a9d39d018b1fd65282ffe7682e822742e93881ebaaa48c3d66766dd3f. Chain 2 (Bitcoin): anchored in block 960306 (2026-07-30T20:23:53Z), 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/CZA040525111.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2dcf079fbf6faedf8dd0394138e9301a99f295da57f26d6e1ab7e83478552e5c. 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/CZA040525112.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ae39d74c33e92f8c6b7d8727f0104ee83be7fa2da19ff667b9c6343b05ab0b4. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/CZA040220201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x593f0e785aa2bbb7e8b75417a61895f109ec34cc433e52b8503409813cbda1a7. 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/CZA040220202.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25a70df3fc7e51833b98853dbbc4154127ce801d7bfb3e0f605051fcd9aa74a6. 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/CZA040220203.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe71ffefc4c7e39cf3993b8f07565e44d16b7a806ffc130efaf4f20cf9d32914f. 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/CZA040220204.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59f513f56aa14dfede64a21d339d2b735a0e3f142e81b1d8a046ac0c9312e0a6. 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/CZA040220205.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaeb9bf5f2f44f79c6716b57ce47cc3fba7754df3078d9a477672ce71bd64956c. 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/CZA040220206.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37b3de9294e49f32b3d2af38091e9c826c0db489cba4d89845a94f74722fca0f. 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/CZA040220207.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5965f540dc77c744e4396d1da0ae01092d357a92a977bf45d22bbcce98da56e. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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/CZA040220208.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37aeb70f6a57596272870fed37a504206133d0c06f8e3a66c8249d59cc2e7c08. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/CZA040220209.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c69f30a6ecc63a261613d78f1fca388aefe4883017efdeffd18dd3fe1af0788. Chain 2 (Bitcoin): anchored in block 960481 (2026-07-31T23:51:35Z), 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/CZA040220210.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbfa36d207764d549aa7936b41eac574744ebeec12675d8bdccaf0e2c5923b6be. Chain 2 (Bitcoin): anchored in block 957249 (2026-07-09T02:31:37Z), 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/CZA040220211.