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 0x1e40255aa904c2b9b1d63f85be7586887b1cac80215559d006d830af764eb9d1. 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/c4f28a3b-1da3-4d21-b708-671c0582933b.json and https://artists.proofprofile.net/proofs/artist/c4f28a3b-1da3-4d21-b708-671c0582933b.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 0xc94dd26092ac01733694b40fec21d64b65f6f9fbca3a919117e4d1bb8813a4df. Chain 2 (Bitcoin): anchored in block 958388 (2026-07-17T09:14:21Z), 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/TCABG1295043.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb231c00fca0ae279dbc935466b3a2c1817a450643f8aebd1cc81f88b7c9f51c. Chain 2 (Bitcoin): anchored in block 957544 (2026-07-11T09:08:48Z), 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/TCABG1295045.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd846a07c86ecc25992205fd6ea7a949fc6d3e0c0030f3827cd23d53efb29dd72. 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/TCABG1295049.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x802794858ce6dfdf2eb9e87111d887ed34a2af6b0c14aec90ee6e457e8bcf6f7. 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/TCABG1295051.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x322d73419aebaad31ec5cfb13a40110426f139a598810ecf2eab8b5a3971e5f0. 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/TCABG1295054.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef4498aca4f7f39960d713f410434d6366f0d68d24e008613f99adef09d8b22f. 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/TCABG1295056.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca0f0016a80b1d458603f233571c3075c3a67a2f2c4b823762fbd12462157c63. Chain 2 (Bitcoin): anchored in block 958905 (2026-07-20T16:14:34Z), 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/TCABG1295061.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ec47d7a7ea275a8fa949ebd674facb894a9c3e27e5a81fae69269357abeef1d. Chain 2 (Bitcoin): anchored in block 956656 (2026-07-04T14:03:39Z), 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/TCABG1295062.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed2bca2cc4fbdebf059494881f5b1af621b500cde66f9c81e5833c5b8a665793. Chain 2 (Bitcoin): anchored in block 958436 (2026-07-17T16:42:22Z), 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/TCABX1482877.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74523c1aa24173da5cf47af4d704e3a442fc8a67d0f4fcc21b3674f9b0c98d93. Chain 2 (Bitcoin): anchored in block 958242 (2026-07-16T05:02:52Z), 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/TCABX1482878.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ce18ccee2285634c561ff61546c13ee030362ce2ed74bc92f6bcd6947c94ae5. Chain 2 (Bitcoin): anchored in block 958436 (2026-07-17T16:42:22Z), 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/TCABX1482880.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c6cfe8321adc70a41839889d6c295a2fc901274847055671cb34f2ed4a6a4c0. 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/TCABX1482881.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a5e1253b8b7a6bff10dbd23efe8264e3dbef9f07f3e47d02b567bbee7954a6e. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T02:05:55Z), 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/TCABX1482882.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc73a987db7b2b1f16bea92fa41a94cd2cda32522754e9be015a5f3f8b48a9e7e. 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/TCABX1482887.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2ce91a586f1c8ada784ce54c9a703423a38953a8e1cbf81a2a747be8f9797e3. 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/TCABX1482888.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ebb2f867f11a90d2f5bc6ba2108f386808f2d719897b969a7bff3eb0bf6ffe5. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/GX4R52162706.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c67803a6d0b595e9752149ff1ac7cfbcc0bc47096daa285c299e90c053fe84e. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/GBSMU7856442.