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 0x3dbfea3b0089470974ffa0688d4351b0c397ec985972bf5dae813217d40f1d61. 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/9574472c-608f-4bc9-b3c7-4aba035045ab.json and https://artists.proofprofile.net/proofs/artist/9574472c-608f-4bc9-b3c7-4aba035045ab.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 0x188587da2a5713bc85b020f492b37492e4383f8717e6f405a7e5d40959ca2349. Chain 2 (Bitcoin): anchored in block 958180 (2026-07-15T17:59:52Z), 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/TWCC32122113.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3dea77902393345afdb7a655dfd56b09c0be42f93284870521de934ed7a9682c. Chain 2 (Bitcoin): anchored in block 958395 (2026-07-17T10:10:33Z), 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/TWCC32122114.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee9814bedc218024ac385b3ca8e3fa9461728cb77ce7ed096adf25ffb9f85a0a. Chain 2 (Bitcoin): anchored in block 958573 (2026-07-18T15:49:54Z), 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/TWCC32122116.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa748a41aa6c72b9cd24e61c9871212151e7b61481be48d81c8875d5ef0c76aaa. Chain 2 (Bitcoin): anchored in block 958176 (2026-07-15T17:14:36Z), 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/TWCC32122117.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8c81d6c282502f98c0e21a7d1678e928681daf146c7a51827b6d0c4bf5505c2. Chain 2 (Bitcoin): anchored in block 958176 (2026-07-15T17:14:36Z), 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/TWCC32122118.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b54e99089ad3a2c7ec0db295e8001e4176d8936dddf9ae2c7eb088268f2c492. 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/TWCC32122119.
Schubert - Marche militaire No. 1, Op. 51
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78f831603a750b787865eedebf92bddbe496071f5af7ab754ee4d9621ec92557. Chain 2 (Bitcoin): anchored in block 958324 (2026-07-16T21:05:52Z), 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/TWCC32122120.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27ee7629e3fdddfec7d0fefaa553b4239161e08f8d7be8b2e9be56b2f45fa898. Chain 2 (Bitcoin): anchored in block 958576 (2026-07-18T16:22:28Z), 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/TWCC32122121.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb46b8bcd3dfc7bc0b6b87c8eeb061a27e9fbcab90c7bb9ceb199f8b6ff6f547a. Chain 2 (Bitcoin): anchored in block 958571 (2026-07-18T15:39:25Z), 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/TWCC32122122.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c0785a0d18030c512cb78bdd0757d9a2c28753674c7c6ddee9dcf6f8403b3ba. Chain 2 (Bitcoin): anchored in block 958508 (2026-07-18T06:27:01Z), 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/TWCC32122589.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07a0b844696f3297ab09f64fefed9dc566e7fac30d68c9f0be38f36c8ba0110a. 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/TWCC32122590.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1eeed215a9728eaf69db34490313a402072b49494eba92a07cfb13a98f48ad37. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/TWCC32122591.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d47e8d52bdfea69136e5f5fb619058bfe558c61284e47290578202d2f663d0d. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T10:20:17Z), 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/TWCC32122592.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcad18279ef803ae0da38d7aef776d537c30e7fc7b71729d400fbec8125e23152. 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/TWCC32122594.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac31a49b7b3a1b5a9f4b82a7ed0807307087f2fc1fcb2d79eb45de5c14a5f30d. Chain 2 (Bitcoin): anchored in block 958771 (2026-07-19T19:27:18Z), 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/TWCC32122595.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43e5ad88e753fdcea1d7b1b9e614e85b5cd5af96f03f8652e669d65732e6e3d1. 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/TWCC32122596.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ac4d101e80878e3bd698e91944e887b7035cbf9410d0bab2c86c11286b810a2. Chain 2 (Bitcoin): anchored in block 956620 (2026-07-04T07:11:13Z), 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/TWCC32122597.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14ca95bafd36e42e12af83423f409e68239493c45342bf99ba86d78b884f58e6. Chain 2 (Bitcoin): anchored in block 956578 (2026-07-04T02:23:20Z), 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/TWCC32123114.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa95c9043d7937fdba61f725b5022f822c88a8b74855d880ab1ded8a67c643a81. Chain 2 (Bitcoin): anchored in block 959018 (2026-07-21T14:12:28Z), 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/TWCC32123113.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x273ecabb0462979b3dbc9d6240dcec9aff95b2b691dbfa0bec8b4a68d6502ec1. Chain 2 (Bitcoin): anchored in block 959118 (2026-07-22T10:01:58Z), 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/TWCC32123112.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x846ae5d4c49a35380c7ce60066a4aa8d9c58a43752b15d1991bc9c9f944bde7f. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/TWCC32123111.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5d8bfa9f1e7e6eb07110e0d4f0823ce00ee2ca3e78809c9766a933eecdbc2f2. Chain 2 (Bitcoin): anchored in block 959105 (2026-07-22T06:33:30Z), 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/TWCC32123110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa24f0a32524d6f249fd5325ac7f491a56fff02817f73e2fcb69d8b694d4ac0eb. 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/TWCC32123115.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1ba33e3c4a1359b8a81bfeb223b35a2db61a1a2f22ac59969804e3b2352c376. Chain 2 (Bitcoin): anchored in block 959145 (2026-07-22T15:39:05Z), 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/TWCC32123117.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4dd1723d37c52150237731e13349a27744d98c75494c4132fd9b2bde55329d79. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/TWCC32506045.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfbfef6e70b16603fb3552ae5162b9abdc1bfb5d36085e0ad1321906e414cc053. 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/TWCC32506538.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22f48e9f9877f99f707ba6d6ad2d96342381905c5a3cffc115ce9c4517b528ac. Chain 2 (Bitcoin): anchored in block 957785 (2026-07-13T01:55:31Z), 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/TWCC32506539.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd07139572111ed74f212028b5e1b20b59371294567ba8a4e98271bd9658a66b7. 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/TWCC32506540.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62692546de60d2bd4556c811173155840bb8ea8638f8291a9d5fc1f494a720cf. Chain 2 (Bitcoin): anchored in block 958218 (2026-07-16T00:33:33Z), 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/TWCC32506541.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9bcf75b77d7703da8433e3fff67d893bdf5cbd08b46eb045166db74880a40c4e. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/TWCC32506542.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67146d6a4d71aa4bfe2ac72f730e3586b87218276cdcc3817bb5f4bd5474e3ea. 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/TWCC32506544.