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 0x24dcdaee34b0eaf1c7b053be072905e135979180f15fdf83cdecd63731286342. 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/ce6f17d9-2be2-4787-8501-efa223ca9c40.json and https://artists.proofprofile.net/proofs/artist/ce6f17d9-2be2-4787-8501-efa223ca9c40.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 0x36f11ce02baeb7e43df1e6300aaf823bafd30512ad125840e3e06c3cdf4753cb. 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/GBSMU8276898.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55b0a0a9950a081a481eabda16efe4c27e94e66bf306e6d0c37063d7eed8e861. 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/QMBZ92253278.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3daa752985a0bc02fbc6c4b39e9ae199c125eaa534743405330dcc615a8af83. 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/CAGOO2233223.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd55e386b2208054475b0b4643e46484b856e1c2378518e8909c40e42a571b96. Chain 2 (Bitcoin): anchored in block 956894 (2026-07-06T07:53:57Z), 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/QZGLM2242086.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1800a7ab281a473ac67f0b8b585f73f956d3c8d427fbd87750559426327db414. 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/QZK6N2197967.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f68d73027e2919095a59792f7490dec5c8401294f5e294892d22131d6aa0c18. 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/CH6542135680.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87de33a05926d4a6a0c5ef546832d9e1baf789ca3cf41c9b918693d9237bc588. 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/ES47E2001791.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11d05a5f6ed041fb55f00f799e25d2358a02d48b28a24ba5a5dfb5accf98d2c3. 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/QZMEQ2091957.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54b418d3573471bd6f1f910a15ac486580f17577d9c311bec8b35d6b81d017de. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/ESA012063954.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7891d406ddd5a444cbf57db066790e15f9d601a364180cdd9651a5a9334316ec. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/USCGJ2071954.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2eb1275a5ba5fc7d1a85b2ed6e660be52567b3d6f36d33ce5b7e2c4c236eba49. Chain 2 (Bitcoin): anchored in block 960145 (2026-07-29T21:13:37Z), 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/CH6542141732.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96f34ddd1b7f664a6b6cfbddb41ba8993a54b13a11e813a6520a72c96a147bb0. 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/QZHZ52228792.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0b362e9304d6c074a1967ed6238af9cdfa3818f7239a0ff6a9302ecaf44263d. 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/USCGH2269897.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21c95f70715bbb3653b1a5177efa560c14c1d5a8c8673124e9338d2227fbd95d. 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/QZGLS2224179.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85b24e0ae13c6a0d2766ac9f2566c75db2f6e1e22bb5276e20ed6c5cadc07c02. 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/QZW9L2494455.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61fb3bdeff444167c260694f54cec01762debe8f1dec03107f3052cf03a70093. 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/USCGH2014608.