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 0x78dfb1cf963c7cf9a30997bde35c31b8a02bb32f8b4ec09ce6443519debe89f1. 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/b23ab860-562c-46f8-be7a-b4aff61ee2d1.json and https://artists.proofprofile.net/proofs/artist/b23ab860-562c-46f8-be7a-b4aff61ee2d1.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 0x13f2f697bc29f0286fc0b4ac9d09d918e48260a7cc9d675551f9235ca9c1a69a. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/QM4TW1507401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa06e865b20d5fb42ddbfe9c90439fb86849723d87289e420d2b77a0a390b8b82. 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/ES28A1010082.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b401d8bafee50f1d46f1b6933a489f7694f0d4c70212d3f281f963a1e09d981. 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/ES28A1010084.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xceb8c68d63326d57063806bdf1ec3fbd16609fde0a4b0f7d824649d91d144204. 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/ES28A1010085.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x232a93bcda3af18d147555f56ce291691744d75343d5c5b292977350a2f57c5e. 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/ES28A1010092.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff2122be57ffdc05562fe37dae2b15ce634ebc6b363bd6cdf5223b7959c96cde. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), 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/ES28A1010093.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6fcc7acb09f80430bebed542dc84c2ab6bf3119a4cce8e284446e1658e9ed19e. 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/US4XG9400893.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e5975b284a00f3298b79085ab98e5df68d6db2fe8add2fbf4d5f0e34dd2659f. 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/US4XG9400895.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa047fe6afb1de81aba1ae06bc67498e18d18f2201c50c0e53a21852bf2d6c477. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/US4XG9400898.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4736eb454144b6a2a71401a7157c347f8983b229d0efeacde78695c6c5e3f971. 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/US4XG9400907.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b566d1642a6a14fbc2f10a855248fd6cebc3f1e198b51709f91a05a66045156. 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/US4XG9400908.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf41c4833f75cdcd5847c29e0c35ed49c6a22ef55d6b5fac11293dec5d869e49b. 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/QM7281960577.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a73c9d4079fffbce3438976756972e99c2948013a89b59dad2402c58db1267f. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/QM7281960578.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9070263623e4ef0334d89de8fa5562128f106eb2453963cca643554c5a5f45a1. 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/QM7281960579.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x904257951f4146f381186b724870d5151b67cc1edd6c8bb408bfc6e1080101db. 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/QM7281960580.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x609e0cccbb12eee9b65dd83d3a2e87e6174542312d354a76a4dbb9c0f3d2499e. 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/QM7281960583.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b64073273df3dc5abe3bc32265ef4dd0abc8d5329ff3051726fa2b127ae67c5. 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/QM7281960584.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c31dac9a7864d5ccfc9443874bcf5225bd776f50529fe5e53bf61dd6bcc53ea. 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/QM7281960610.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33df9f6a2b057e2198d8c9105d879defb38f8b467599ef297e5f15f10d23eb3e. 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/QM7281960612.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2190ea47f7bf42887007c7e1cb4ebddc78c3f87d644967a8fa96c30cab16a26c. 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/QM7281960613.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x751d9aa53974b724a8c16fa9c01e7f73e61eacaadca53e297559bb6d9dca6534. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/QM7281960617.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d56c783b82acb0d8cc980fd7be71f9d2e6ebe6945ba874edf8a0b691baecf8b. 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/QM6N21453827.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65f7caf8f122d14dcba1305840277802be1d6e15487dfe48b5ac6ffb6cc2d480. 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/FR2X41976721.