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 0x77c4cc9be2ca85b4897dd277487abc679daae6c0c4d7a87ee700556b6ef113c4. Chain 2 (Bitcoin): anchored in block 953778 (2026-06-15T11:57:35Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/af28d44b-1245-44dd-ab4a-07e1d4f910d3.json and https://artists.proofprofile.net/proofs/artist/af28d44b-1245-44dd-ab4a-07e1d4f910d3.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 0xd23df416b82df09e1c1345ecf76b7c424437b1262ca021f81220d651a431b1a3. Chain 2 (Bitcoin): anchored in block 958392 (2026-07-17T09:46:31Z), 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/GBIGR2058001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c9ad7bf17dd908aa3d33cb465d0689dcfd4c5d22541935509e6095550e69cbf. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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/GBIGR2058002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca65227bea0d2a55ea8d6fefe7df6f7736ce20ed8e0f2cd46e2e93ca9ebbcd59. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/GBIGR2062001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d7595ef0f9fc0fa44a39ff361ffee916df23641ecb72208181a30a973580f7e. Chain 2 (Bitcoin): anchored in block 959001 (2026-07-21T11:41:42Z), 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/GBIGR2062002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72bf22a0b28268b1db5791875d0fbbf172370951901ca1b0940fc20d454f0d32. Chain 2 (Bitcoin): anchored in block 958520 (2026-07-18T08:19:09Z), 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/GBIGR2062004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d8e36a0997c246f9f1c6222c05e4a9905e188b6d812bb27fd4c1455a699f65b. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/GBIGR2165004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61ef346446ef2a6a4f4548f8910156316c621ab0a573b9675f0af71a960f4624. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/GBIGR2165003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8951cc6427945c928798c883f1caa1e10e277ae8d284cb7b15dee684762d581a. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/GBIGR2270001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcafc1a5bbe8ece25a0aed0b186cb14801ac698999af9f18c6ed0da90c2593f34. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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/GBIGR2374002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95a45dddcc85bab2951070e33fed2993221ee75f67e130ef0c5f238fb86dd186. 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/GBIGR2374001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcafc1a5bbe8ece25a0aed0b186cb14801ac698999af9f18c6ed0da90c2593f34. Chain 2 (Bitcoin): anchored in block 960459 (2026-07-31T20:22:46Z), 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/GBIGR2374002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5effbc8c58f48a5b09a8ea9dc170d1bb38f6dc712e9f9219785039904460f3a9. 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/GBIGR2374003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ae8e67f4580fe00c3b45be18061663fd6c503f77f8d50d06f9d7456f09fdaac. 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/GBIGR2374004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf83bd59b348f114206cba26be695180f2226f057f64fb764787e214098f04bec. 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/GBIGR2374005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf59aa725734c83af8ab971dec61356a68568c3e7358f16d23a055c47cd39c7e5. Chain 2 (Bitcoin): anchored in block 957064 (2026-07-07T16:43:08Z), 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/GBIGR2269004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8bf3391be6f4f2078422519223e79d5fb9119e2f1ef86953eff7517e044a2a64. 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/GBIGR2404008.