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 0xe88863f21917b1b635ed9f786db8bc0fd35d15c7d8d7cef2d9467748d04926d3. 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/e76f8e76-cba9-4e25-8f53-e4408a14b906.json and https://artists.proofprofile.net/proofs/artist/e76f8e76-cba9-4e25-8f53-e4408a14b906.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 0x40c31356b6d7d74e6387df57b13e48c0ebd9e6395b5657a11afeb7893c5c717b. Chain 2 (Bitcoin): anchored in block 956776 (2026-07-05T10:59:37Z), 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/TRBAE1902191.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23058e17f3e6861893cf4e003132833c80ae2ba23fc64fb2f6bf830238cb7c23. Chain 2 (Bitcoin): anchored in block 958980 (2026-07-21T07:04:12Z), 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/TRBPU2000972.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x247e65143c99da506636b151b261920199b440faacad3ebcf1571286720d4c87. 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/TRBAE1902181.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d9b7b786d9ddfbc5a4ba4c93467717d5eee3310c32186ec76598dfcb4a0980d. Chain 2 (Bitcoin): anchored in block 958590 (2026-07-18T17:28:56Z), 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/TRBPU2001031.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b528ea1680f35fec72101e79aef1ae18253b720ef4c6aaab2aaf577b4342888. Chain 2 (Bitcoin): anchored in block 958329 (2026-07-16T21:48:38Z), 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/TRBPU2201252.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f1678bfb7cce59134c33f6cde7f5a8e14498e1c27dcdf3e7e4709923f4ab5d5. 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/TRBPU2100091.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2496d216c782bbcdd9c1471f01dca92b1b4c115b526d0508279d89499701754. Chain 2 (Bitcoin): anchored in block 957591 (2026-07-11T17:21:30Z), 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/TRBPU2201948.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0fa89f10fe00483d4bd713d8c5a2009c4c77389e977d6a30323007edecff76cf. 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/TRBPU2300312.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xccd259a5d583eb813d19b8049ae06f0b4298d86b74ce22df5154765c83f4c204. 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/TRBPU2400415.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e2d4d2347f40162774b2dc6fa797b51791405dd0a01941566b3747cf7bac1e7. 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/TRBPU2400485.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49ea5bac38006a255a29d16afe389978b0f3e25c56cce1cb46c9611fd675c04a. 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/TRBPU2400913.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce9f4c994cfe87af5a73049525a0a8808910c96240ca4b4ecdc4a81cb490887a. Chain 2 (Bitcoin): anchored in block 958538 (2026-07-18T10:30:13Z), 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/TRBPU2401011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17e8dbefcaab1d3dd6aec9fa216ac1b9695f232a21b8eff7e0b437aa8279e162. 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/TRBPU2500070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf46a376c0996982826c85200f598b47494365ce7dc21426d344beb23df473007. 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/TRBPU2501614.