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 0x43c5dc4edb2a3f7ceb99c8029aee7af62f275df3943e75c6f01f50ec5bc65c30. 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/e56e21c0-ab52-4541-afd9-75a02340b599.json and https://artists.proofprofile.net/proofs/artist/e56e21c0-ab52-4541-afd9-75a02340b599.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 0xf191c7bb0987d5d071afb45fae1876f8974a2ecf1f46fbe9d95b253717c2227f. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/TCAFH2007910.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a326b6804be8f8bc0bf8080e8f713a91e8263798ebcc568a362575d981bd20b. Chain 2 (Bitcoin): anchored in block 958238 (2026-07-16T04:30:31Z), 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/TCAFJ2144509.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f4c12f152605b189c1e6d650f93354062200eb088185740867c26ec759469c1. 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/TCAFJ2144511.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9fbe29fe17466ac87281bfe95e04e08bc3d0ed74322e0b88410b158a7c97345. Chain 2 (Bitcoin): anchored in block 958432 (2026-07-17T15:43:17Z), 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/TCAFJ2144513.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb403df5d3ac157931535cffb016184e27851357abd9b7a17f82e4dbab094cc9e. 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/TCAFJ2144515.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08c92c1ac1445db10140cd071edfd88a0ca4456032ab81b1ab9faf48146f570c. 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/TCAFJ2144537.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a4b28023ba9162d37ec02b5dbbed2ce94002e0cef84e614e5d731f87d9d3a50. Chain 2 (Bitcoin): anchored in block 957770 (2026-07-12T23:17:00Z), 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/TCAFM2138424.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2826930a9fe295b37f440b08826e17581bb07ae01880f4a15208850794dd64fc. 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/TCAFM2138429.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x211d26aab420c709d078fe4c3ccfe0803f0721e178205886a7d0dd8008ab8a7f. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/TCAFM2138432.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3189b67c702f1f49602d680e1ae440de0578db7c0c19788c9bdbdd9a13113dc4. 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/TCAFM2138434.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea6798494e0ca64f52a49c9e7f3fa4e29f22538e82d32d3fb3acf94e34ac15ee. 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/TCAFM2138435.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14bd982fa426e75f62e550481aa5f3a116ccfd494e2432383b9429b9d665b17d. Chain 2 (Bitcoin): anchored in block 958185 (2026-07-15T18:19:04Z), 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/TCAFO2125616.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3b38fa06f4e0e06fad53d5ada6523403d249a8af105cd119268a54d954b4780. 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/TCAFO2125636.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa195f9d3cd32e4de1d889f7deb0240e54597e440b117145f27d1d3977dbcc08. 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/TCAFO2125646.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73f91d022efdec249d58e93be8b9499651e2bbd5bc1ad2d7ca5c2b1096bac63b. Chain 2 (Bitcoin): anchored in block 958377 (2026-07-17T06:48:00Z), 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/TCAFO2125647.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf99794ab9c6cb8a1f5d2b068ef0f67a411d5cd2c430bd4221deb97228cf7d2c9. Chain 2 (Bitcoin): anchored in block 958543 (2026-07-18T11:58:44Z), 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/TCAFX2180185.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc738cea74fbf3b65ee16274fb290e89a331f3b0df32ca9911a49588091671609. 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/TCAFX2180192.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c42369850bbe5919dba9fb139b363e8da4592853bc4b9cdfe7a0d85184c5e37. Chain 2 (Bitcoin): anchored in block 958594 (2026-07-18T18:05:01Z), 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/TCAFX2180194.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xebb413a24b5c8dd865608b85b5edbab0d82e8a42aac982b50ed051e63c9b5c86. 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/TCAFX2180198.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b003c322e0449a718252d4787754e0b2d75b11872a18985296e951cddb24f1f. Chain 2 (Bitcoin): anchored in block 958985 (2026-07-21T08:39:15Z), 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/TCAGA2208749.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd24b656795a4f37d68a97206c1b7bf76d374237a00e1249bff9b308f3628d61. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/TCAGR2252453.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfce3bfdd6d5709dced1e72d2b04844f2c31f90e9dd0a2ce5330c75e53247570b. 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/TCAGR2252461.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b12c1c077c37af6984313352577700d67ebca3c2f7356c0d30580ac588c65f9. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/TCAGR2252470.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x416668782e58b6cf4dde19685e41d679191c10f252dfa7d4dd98579607ef6aa6. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/TCAGR2252473.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ec5a06c7f9ecc559a4819ce3b0dfe5592d7e8096e36cf255ecd6db4682765ee. Chain 2 (Bitcoin): anchored in block 958377 (2026-07-17T06:48:00Z), 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/TCAGR2252480.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3021cd5251fed000aca3053bd62bf8e06beffd57c891d7805769b69f78c063d9. Chain 2 (Bitcoin): anchored in block 958234 (2026-07-16T03:46:09Z), 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/TCAGR2252486.