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 0xa396a089203dc2b41edf95db2a6eb7d46a95fefcfd18904ca15bd3c628f414c8. 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/a1d324b0-76f6-4503-a4bd-c8a59f87837d.json and https://artists.proofprofile.net/proofs/artist/a1d324b0-76f6-4503-a4bd-c8a59f87837d.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 0xdf9b27e2ba9725754b2862bc89ea82cc5353cc74326fcb5868aaa94ab8ddabcd. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QZNWU2194039.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b710aaddbcd131453640aba2c1e5df20819e6b53e9a7d5b6bba6d6916902ec8. Chain 2 (Bitcoin): anchored in block 958069 (2026-07-14T21:37:55Z), 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/QZTAW2252542.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ed3cfd0aaf651acdf955d33a9d9e5c796c6fee72a014a088a5c4a9892317889. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/QZFZ42205872.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26c16f4402ef2bc31dc32ccedc287f91c0ce7ae36620a10072998d4a3d4d0f3a. Chain 2 (Bitcoin): anchored in block 957851 (2026-07-13T11:26:33Z), 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/QZK6P2288609.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5fb2c02ef23e6c03e70020bfb214736d9350492278b7ebdbe1e133c0533deaa6. 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/QZNWZ2203649.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7a0e347ff70ff75ac24abc7303383e9f56db47805f1e71d1d5f3c7724d5c3b5. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/QZFZ22361944.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5703069726462fd1549dcd248bc5dc0cfa522179d8114ef1ec6b3e159c73b9e3. 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/QZHN32593202.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe40c4a9668df91a1b0c5a9f2e3fc1c0e0dcb1615666b1e99233b55ac6347b5f. 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/QZNWR2312571.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b39331086c4e92fd4e064af97e58c5831a23242888bc90e342731ca006c366d. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/QZWFS2303414.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c42e1688d509152341b0e12f20dcc92cf95fab180563401ab2c38b151264fff. 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/QZNWQ2498848.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc91ed378d5b09da26a697a989c045faf19529edbac8d9d0fb74e911482383bcb. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/QZTBF2343956.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf03f39c30cd11919213e1ceb3dfe86cb6f25be8dbac8af7d7da9ea37b4dbcbed. Chain 2 (Bitcoin): anchored in block 958208 (2026-07-15T22:40:25Z), 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/QZTB92236670.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b55b96f2adf6e7bf9c07fdedddec7891f6d6b6074a6b1da5bce5713a867a7d4. Chain 2 (Bitcoin): anchored in block 958263 (2026-07-16T08:19:47Z), 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/US7VG2522631.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40d29a9f2e37d7568263b7d0d28be15c5a64738ecd700352bebc76b4777d534f. Chain 2 (Bitcoin): anchored in block 958208 (2026-07-15T22:40:25Z), 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/US7VG2522551.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3675273342fd036afb8053f78ff6793d475120327a1dd4f47a6003c91d1c059. 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/QZTAT2321188.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf4db2b81f6cc9e0fe438d6766840a667f62611dd1ba624de07771a17b9983b0. 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/QZTAT2321189.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x328d29d8dd2d77ff6c4866626d2879b45659b17a547ce46931b8745a0ca6b0f6. Chain 2 (Bitcoin): anchored in block 957638 (2026-07-12T01:56:41Z), 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/QZNWQ2375320.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6df86f222c5d86fd95f50ab03009759158e3ffa879d9c961c4708147e2c0962a. 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/QZFYY2261823.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f77d69b5eb1359d86caa20b4c5311df0ac223e5486edf34a538e291608082de. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T13:14:32Z), 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/QZFZ42208455.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff678b0dbaa463716470b64174330ee1d4d06b038abb93abb7287b3b4a9a8212. Chain 2 (Bitcoin): anchored in block 959051 (2026-07-21T19:48:03Z), 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/QZK6M2308575.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95a1321d36d26e339aa4264f89d524bd96c62378510f321c5c57e179c2cbcbd8. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), 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/QZTAT2321183.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x918eaef30bd235124ec5d4523f0146eb323cfb642a0cb582d46f0f6d08686cf3. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/QZK6F2504921.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99f1a668a4c1a8fb57dd643277967576fc5df556e6689c15c7e87ebb1a079c2a. Chain 2 (Bitcoin): anchored in block 957782 (2026-07-13T00:52:48Z), 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/QZWFU2550196.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd98100b5f8a473834ae93a5450574ed14bbe219f43287e29d68ba8dd7a25fad7. 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/QZTBB2450661.