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 0x3885e4008fadd8dd5756f90d047119f82d981c07f689e295586f4a118fbb6a4b. 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/f389b649-9cbc-4364-94e6-5ae0e39e9cc1.json and https://artists.proofprofile.net/proofs/artist/f389b649-9cbc-4364-94e6-5ae0e39e9cc1.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 0x00b1e429d905494eaa2b630e66c482978bdeb96f470c74d854483b7d7f7abdcb. Chain 2 (Bitcoin): anchored in block 958349 (2026-07-17T02:28:59Z), 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/QZHN92492165.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ea108a4e14d3271af0f549688e369b2782b24052ec55f9c09b6c309344328cf. Chain 2 (Bitcoin): anchored in block 958142 (2026-07-15T10:09:30Z), 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/QZHN92492166.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9fd4155abcf0e3db00b0054106a87835b90632cd89d9fcca123fca13f23690e. Chain 2 (Bitcoin): anchored in block 958726 (2026-07-19T11:47:20Z), 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/QZHN92492168.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ff4de559ad84575b37ec9580ebe0115acd1f7d3639493c86049f2ca6eaf8021. Chain 2 (Bitcoin): anchored in block 958079 (2026-07-15T00:21:05Z), 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/QZHN92492169.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf59c5d396db644194a8492526625a1e191a6edaf228799b8bd53f983c7bc05f. Chain 2 (Bitcoin): anchored in block 957751 (2026-07-12T20:41:42Z), 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/QZMEN2446596.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25cd3baadf9ce4b17215d0690751591c16bc6d1de2c18a676570ad7e613f8e6b. Chain 2 (Bitcoin): anchored in block 956728 (2026-07-05T01:43:49Z), 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/QZMEN2446597.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1455649248e66ccbb87a72674aa58d766d248b26507f6578ae7ad288dc61e860. Chain 2 (Bitcoin): anchored in block 958662 (2026-07-19T04:43:15Z), 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/QZMEN2446598.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7fa2dfe83c9a7b7bfab87cf96387be64749883607a319a4f9835883e3a57742. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/QZMEN2446599.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6ce962a80de0623966a4b434a3c1a5b4c215ede6e6473a84af80dd33e3d4991. Chain 2 (Bitcoin): anchored in block 958561 (2026-07-18T14:22:01Z), 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/QZMEN2446600.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf6fee2189be33456b6da82347ae8349eb21e4b8d563df5f731a39e0ca0859b5. Chain 2 (Bitcoin): anchored in block 958734 (2026-07-19T12:54:58Z), 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/QZMEN2446601.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38f7e4fcc3f0db2615159f4fecd297cff07fa5c51e8eab31ead1b6da86a391a5. 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/QZMEN2446602.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e40c63e57f32974da64c995f7b05755dfe3000e10d6a086c75e4b4655394106. 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/QZNWW2481117.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4cf4345cad992d05b277a6c2187e801472daef46500a66717aec515e4472d6a. Chain 2 (Bitcoin): anchored in block 956711 (2026-07-04T22:48:52Z), 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/QZNWW2481118.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82af93b98b78398286b7bb24060f9564839c389e659150b698ce81a7c0ac9d8a. 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/QZNWW2481119.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x212bf73df5b6a9fa1d89f74c9d83b0bb21669a91c59047375c493fed623dae61. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T15:55:19Z), 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/QZNWW2481120.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad8f9e11af2ce4f5d353456922078c500c543c3c0e465bd45d67384cf916a9f9. 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/QZTB62465903.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30212af2dc274c355259a6d4e464ae49ae8345b3823c46dd19e57fd8a388ac1b. 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/QZZ762490970.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4c0cffb226d01ec8d6c6d45f927d9905121228e2aa8d855f7f546ee5ec361a7. 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/QZZ7R2449129.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa35eef41391f2221936e507cd9d68156f5c0b26cddaad50b7f580d27f78b85cc. Chain 2 (Bitcoin): anchored in block 958140 (2026-07-15T10:05:23Z), 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/QZFZ22544441.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe62901f634da17a62c91c47eb85417bd71cff5532d48b2f0a61995f3798c318d. 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/QZFZ62573882.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f6cb5e4ada6273cacb3f95c5e184b00ee10991c92ca33acbe3e381ecfae8aed. Chain 2 (Bitcoin): anchored in block 958268 (2026-07-16T08:56:51Z), 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/QZDA72554603.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17a99e0cc9f4fe02b412fffb2a19b3c1db4ede226092f092651d5e0ce14702fb. 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/QZDA82583456.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9876e7eb7af986c7a3d56ec5278a70fc8883467139667151206b38f78b6e4111. Chain 2 (Bitcoin): anchored in block 958335 (2026-07-16T22:37:47Z), 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/QZZ7N2592208.