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 0x30771a85aec1133d560c930f37eee1436fb22f0d1007ca20842a8d7bb30ef48f. 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/a90d0772-0b02-4388-8153-72408904789a.json and https://artists.proofprofile.net/proofs/artist/a90d0772-0b02-4388-8153-72408904789a.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 0x7afea13900f582329a92aaaf70c7d95e45886dadcc93339d1b0a0f6f8aa95022. 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/USSTT1100007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ecf2810e47515abb0ac3a4a45e6249c7f20c33fc9220d32da0943a31d416a2b. 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/USSTT1100001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb84e65cbf394100dbb2b2e423589b21a54b3b12802606b5c927092f7f7ceb93. Chain 2 (Bitcoin): anchored in block 956861 (2026-07-06T01:57:57Z), 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/USSTT1100002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3b582af16586eb2833c09e2a237c5dc3b6c007dbfd5f14aa6f5fbe0cb9bff7d. 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/USSTT1100004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8600a06654205df727e60ab11701287dba26b7af244ce3b3923e542afa7e267d. Chain 2 (Bitcoin): anchored in block 958774 (2026-07-19T20:03:27Z), 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/USSTT1100040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd213c64f92df3447080dc9f4797631a6ac3584e47ab6a126b5d8f6a88c210a95. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/USSTT1200077.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x586f5343dd6c7fb26ea00bd153b3cd474f385ac56354cfeb92b8dcea93fcc98d. Chain 2 (Bitcoin): anchored in block 956402 (2026-07-02T22:05:07Z), 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/USSTT1200078.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42c52fe7c139db0e9002bf756541a05c2ef00fbfd3280456f822fe220c737b73. Chain 2 (Bitcoin): anchored in block 957717 (2026-07-12T14:54:03Z), 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/USSTT1200079.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5bb4a621de32f6558e2bfe7f728371ad2cc6f1606892a5044a13897ae5cf742. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/USSTT1200080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0ea39af37c0015ee41872500213f9ffac70e27cfd6d1690fd09a3aedce8394a. 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/USSTT1200085.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23641d974e75ef3cd5258a6946660ffdbd07d197da208ea27e5ea4ed984fd46e. Chain 2 (Bitcoin): anchored in block 958828 (2026-07-20T05:21:06Z), 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/USSTT1400123.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a2d17e867120114c77c8d9183703e1d3c10cc69b7b2803b6fa12b3ef1272ab5. 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/USSTT1400125.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0dd660ff2d6c45e4d805df923e02fc288a121094475da3f6d72a60731ad4bc9. Chain 2 (Bitcoin): anchored in block 959002 (2026-07-21T11:47:29Z), 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/USSTT1400127.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45f6328ee8515ca962c90a6f85122aee8672ed9dbd84caf0fe439397a7cbed2d. 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/USSTT1500169.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x408706c6d58ebdb4cda93487a6a8dc2f8f4abda9c9aa0245ec42e9325cd4e791. Chain 2 (Bitcoin): anchored in block 958749 (2026-07-19T15:48:23Z), 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/USSTT1500160.