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 0x88128de62e4cbf53bb76aa3a737a5ee4ff1836a14529c8921a54d82b4565632a. 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/780b63ac-efe9-4aa9-b85d-e9ab50fc7012.json and https://artists.proofprofile.net/proofs/artist/780b63ac-efe9-4aa9-b85d-e9ab50fc7012.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 0x8d25761c99d3cfd7c6ff279715a7ec58f8e7260b6f49e685f5da5a8255cf7ce4. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T04:18:36Z), 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/USHM91639122.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb3d01d9e4a4d14b89ac7b64554d341bb2250a9233f1022868867d1dcd4425f2. Chain 2 (Bitcoin): anchored in block 958746 (2026-07-19T15:36:35Z), 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/USHM91639126.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x943166c2e7120c3fdf2097cfb696063142e05fe449ea38b53a3ab73770328c99. 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/USHM91639128.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb85cfc2ff03a0bf772e73a1d075a0f97109f1df1de4b31d8132b702a2e3b13f7. 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/USHM91639129.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x793f25594eca2bf05937c2c239560d610230ffe8b35b4f1d7e85d6a01b8192b6. Chain 2 (Bitcoin): anchored in block 957898 (2026-07-13T19:28:48Z), 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/USHM91639130.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8304d7109eb3e7b406b73bc5e107e7483904ee248a4abf21ed4cb8dae6311073. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/USHM81795260.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89e0bda03c250b7e4758156d19c76dcbb5ad5b4c965a95a4774ed43c799e547d. 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/USL4Q1744680.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc518e8a29a8754c0978bf3613d65cf546d3ee3ef951c86e06e9b4b0d5196d2c8. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/ES71G1840270.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x013f459f7b3a3e5c2b1d8f3c3503ca364390f44aa1ed940c35143e8509bfa112. Chain 2 (Bitcoin): anchored in block 958901 (2026-07-20T17:57:26Z), 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/ES71G1840269.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0970eb1222c45848cf7bcbbaf22e1ac5f617145b04abb8693a25fa271de4dc7. 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/ES71G1840273.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8d02ad6d0c2b640357c7715bb540ee11470b18968000a92b1c70b94fa5a8182. Chain 2 (Bitcoin): anchored in block 959084 (2026-07-22T00:50:00Z), 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/ES71G1840274.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x581f9b88786238c71ad18524847bf6ba5a3f71dd1ebb0f91325da42a4b645e5f. Chain 2 (Bitcoin): anchored in block 958324 (2026-07-16T21:05:52Z), 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/ES71G1845292.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a4ceedfe4fd1322c25524f19c9a7fe4634459aa0ac322a83d9b89daa5cb8d4c. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T20:54:55Z), 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/ES71G1865733.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf133090451e1603289ddac16bffa28f4f832137e2dd75754d10561d262ba321. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/ES71G1867316.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0e3921ce4de7093d9fb2fe78b3d90209761c2df5502865028a00d2da641f3f6. 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/TCADZ1867922.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf8d6d6236c8075a7aa131890b94bdebc8f1b2813d1f14e66f68d1727d037a01. 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/TCADZ1867926.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa918f67ccd500d7676d611b0e43796a9d447ef8b73ba38c9f8b6384767a6e13b. 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/TCADZ1867928.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12555e11755b148dc83c8194ad1e4bfda0af77b181c613ee4342178daeb72903. 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/TCADZ1867932.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5cae7acff160ddf151f38da607e91d6b02b7c7cd3fcc181266c8bfcdb33683a. Chain 2 (Bitcoin): anchored in block 958631 (2026-07-19T00:50:09Z), 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/TCADZ1867938.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x773a770a13c80d54d990873aa35f0fcfbc995afd6d855e6447f98858a2594ec2. 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/TCADZ1867950.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda26f70cbba250156b2f16d9fe0ac33a46d53b1a4d02446046513721f22829e7. 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/ES71G2061304.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb14d966853a1c15399d393b13662de4189a26c64ea8ce2886f95baac169ca961. 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/ES71G2061307.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9da668eda7dcaccf9769a282cd2634a2f0c4865ea9cc9031f7ed4165658d6dcf. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T17:53:00Z), 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/ES71G2061308.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0dbd6365f9bb59b8f95288cc6fddf1cade48102c1ed9961ce602bc08fd436738. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/ES71G2061309.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60b2363a11d5929ae1fe339a6205f0bd012ea0a5ab0e1df339bf29ded4d4ae7f. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/PT2DY2100179.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1be87359c7603ce69e21175843659805b1fb0b46b5b89c68eed848ee630984f. Chain 2 (Bitcoin): anchored in block 958228 (2026-07-16T05:31:18Z), 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/PT2DY2200131.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ef3e31d26fccfcbc9bba7e8aa00d4cfe3353f06196c261261e1185d8be08c55. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/PT2DY2200133.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f03c6a3519f95f6daa98d908f3a0d59353a0aa66ab76feaf3604fa0af2584b3. Chain 2 (Bitcoin): anchored in block 958576 (2026-07-18T16:22:28Z), 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/PT2DY2200134.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70e5ea6283ce41f32e5299b5a0af53f046d381bdea95112180a73e9e4a947f36. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/PT2DY2200137.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe811561f12d6aa45ecf03d836a9ff735f895575d1497552cb5a78b4299e45a34. 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/PT2DY2200138.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1046861b4345dbdef46aa62f8b9218bdf5a9bd73a8c1cb6076b6f80bc8f6ad60. Chain 2 (Bitcoin): anchored in block 958335 (2026-07-17T00:59:03Z), 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/PT2DY2200139.