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 0x70d859afb679d5503f9b749ec8c28ef1610b20ec6e56e3b536060414da123aa7. 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/47610800-7cad-4cb2-b11f-e0adf70520b6.json and https://artists.proofprofile.net/proofs/artist/47610800-7cad-4cb2-b11f-e0adf70520b6.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 0x866e74135b438b4c57aee8f9bf9b602673e593074660fd2f0b589788f5d08b95. Chain 2 (Bitcoin): anchored in block 959026 (2026-07-21T15:38:13Z), 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/QZ9Y21773420.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd188db8587870895e53fb6842cdea0624172596389d1a4de0efef9bea13dee3d. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/QZANL1728565.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a94321d6715cfce4d9989c90292e082b5769eaa4da7da3883c8ab57b31915b2. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/QZANL1728568.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3648363297992ef11309b3bde7eb72297fbef5006adff672c7d2be9be8bbe049. Chain 2 (Bitcoin): anchored in block 958746 (2026-07-19T15:36:35Z), 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/QZANL1728569.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7219e435828dd00218a963e8f0b66a3916c917ff62f0cb6f8c99d17543e20dfb. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QZANL1728570.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59cef3fdefafc36b6f3b744911796ba10c2c518a6c0d418fddbd62bd0a0fab3a. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QZANL1728571.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64cfd3bcb0158862c3693d2b602965ce3bd4713bc2f13f009b62ba24ff1373fe. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/QZANL1728572.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87c161fc826ce18baab42d7e09cc901611cb6509f88f4fb9be50cfacce23b3ee. Chain 2 (Bitcoin): anchored in block 958689 (2026-07-19T07:11:11Z), 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/QZBRF1882323.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3220a0f3e934f8b0c199d6376664778b8c501f4ee4000ba637ea67950b2d8488. Chain 2 (Bitcoin): anchored in block 959096 (2026-07-22T03:48:36Z), 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/QZDA51890673.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5cc8f8808b6bb21d4b07c76596b48571a2faa0f63ba6fbe69d5ef178701cf9e6. Chain 2 (Bitcoin): anchored in block 958383 (2026-07-17T08:20:01Z), 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/QZDA71825516.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd2ff75cab3b81919cc319e617db19fc190367b402142ed45f82c6075c11b94b. Chain 2 (Bitcoin): anchored in block 958203 (2026-07-15T21:24:46Z), 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/QZDA71825520.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad030f417cb94cdf7a9f74e21cadfbd67fd7f5096a1eac9e9dab3d923609509e. 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/QZES71887463.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6d3fad3742dd2d4aa82627123130ebbc8f2e62cb760144bb4c6d83f42df44db. Chain 2 (Bitcoin): anchored in block 958924 (2026-07-20T18:54:07Z), 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/QZES71887465.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf621e8050afb2fa162e086e24ab8b9a9c4a128422374b892a007c627b96d9f59. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/QZES71887466.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e25b35da434cdd203afe68ce26deb03820ba8f423b3c357efab76b0efdfed52. 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/QZES71887472.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4fb7c86804bccfc9bdf4caeaa0d1420da424de1d6976c10c7937b259285d85c8. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QZES71887474.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd99e0a4c51571a2acf56068abf51d9ea5021a89f26df689230067f0c3f8c4837. 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/QZES82083371.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x564949c927e435ba599695981d3be4e562f250b6cfc291533c803be54b73c09b. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZNWU2224829.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0864707b7a92ebe01a5f537ae925d87d7199a6faef9c5cd98f8a545ad70e3015. 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/QZTB52475232.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7019df3cc0add763e83d5f377c3df3d562c650cea0f672db761b36b612114df3. Chain 2 (Bitcoin): anchored in block 959031 (2026-07-21T16:15:11Z), 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/QZWFH2422298.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ab376ebd6e2243d8c1f3a9f187f45c2def60496cf580a6702d47b2570eccc72. Chain 2 (Bitcoin): anchored in block 958917 (2026-07-20T17:53:56Z), 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/QZWFN2449989.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ebd59b1fe6e3ac3208485ac1474f4834caafdbf85f5b87849dfda6e8978e897. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QZZ7P2452948.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc14a4a640adb0f75c6b1014f13b6a24be4f5c51bb04624c696886a550fe64cd7. 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/QZZ7U2425452.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcebdd1007f8ab95a9c132431b758f328549dbccdbb4db347e2f03865d2f59759. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/QZES62549458.