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 0x65f710754cad5fbd90cc1a58ac5c42b8025897a062dc82009c77c9ac7462e890. Chain 2 (Bitcoin): anchored in block 953408 (2026-06-12T19:28:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/eb5b39d6-af3c-4ef5-9b09-9d198b9c5286.json and https://artists.proofprofile.net/proofs/artist/eb5b39d6-af3c-4ef5-9b09-9d198b9c5286.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 0x20a62ac37b46607f4817df2a202ac6715df07e3445241b05c9e358cbb73c218b. 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/FRZ111000688.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57a760f642a0ef91b5d81adc645e71efda249ad1a85171c58eb9ed46ccc1412d. Chain 2 (Bitcoin): anchored in block 959034 (2026-07-21T16:34:25Z), 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/FRZ117400580.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89f70d8b83703f435b82886d0971ee47ad0771349308b6f7c44456f6b54d4a45. 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/FRZ117400560.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05e0168f95bbd0ad6158fc243c383a454f0ea544ea9d1c899c116e1d803e8259. 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/FRZ117401340.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe63393cdc46804622bacd4f4a5127a98751703bf962708b4fd99727113ea49e7. 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/FRZ117400570.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79b00987ebef897ed74be63449eff0239743c551b69232341d44ae315e2ca428. Chain 2 (Bitcoin): anchored in block 958653 (2026-07-19T03:54:23Z), 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/FRZ111000690.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0544cf90fa2155fff358117da0b2ec03a67b3764303a274ed7b92a336f61683c. Chain 2 (Bitcoin): anchored in block 958876 (2026-07-20T12:15:48Z), 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/FRZ111000693.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05f79b02babea6109e22eea146f1a59747be40b0799fcb005b7b85be2ea49709. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/FRZ117507140.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06a0317dbfc520995a389dd906abcb854b71a84d5492e9dc05718ef1c4fa6515. Chain 2 (Bitcoin): anchored in block 958256 (2026-07-16T07:22:18Z), 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/FRZ117507134.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7bd0ff459d6ff747879ad2afbe0d3bfc7de8a11e90ed2fad333461c61852661a. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/FRZ117500830.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e1608bb83321acd3a95016acd107e05ca8e84fdd9af21da4fb85443b082a21b. Chain 2 (Bitcoin): anchored in block 958650 (2026-07-19T03:36:41Z), 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/FRZ117507136.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58b37e2f361f08989b6e53db3ac5effb0827d0738ac1ba7ede77b5de42379524. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/FRZ111000695.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6defe4ebb5aa75051609354e0cce3c09f795ad0e4ae05cca55ef8a1a220af975. 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/FRZ111000698.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbee3a5ac5aff460c232d9403b1a21f279a409230e07b0a2aeae4a7a24c5aa1ec. 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/FRZ117600490.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c92110401270776b8e1dc90fe5abff9d152df8e1e8f6d709b5b3205988522bf. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/FRZ111000701.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4b8ac869b39e39d3526cecacd24f6a45fadde5f9815d18ceae7764215b40f60. 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/FRE340400120.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x470f453dba07f00fae1dde3a8c65b3501deb1022a87cedf4d775e2606947714d. 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/FRE340400260.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb4e031db3ad56705875645670aaa58b6f51d0975b273cfdfaf24ab852722c6f. 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/FRE348901220.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa807239fec4b734bb23d1c249a01d335e9a857fa4920f5b471e7469b043b428a. Chain 2 (Bitcoin): anchored in block 959024 (2026-07-21T15:31:18Z), 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/FRE348901250.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x544cd8bbd044e9a8c7e2dcde8d78a3c59b78b6b38a26d3b955f68dca5edf34d9. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/ES5301662550.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa77b40587dfe6a742537b9a74f0d54229a6a7ff485414a836eef08111cd30b5a. Chain 2 (Bitcoin): anchored in block 960164 (2026-07-29T23:23:05Z), 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/ES5301662551.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe54db669c8e2b9d0da67188b7a0ccb1d323b8bb504212155d390726d6c1bc47e. Chain 2 (Bitcoin): anchored in block 960199 (2026-07-30T02:30:29Z), 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/ES5301662552.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9553e4d54339739b81985b1ec447c61a4c4ca2a4e2c06905231f5677c2f02a1e. 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/ES5301662553.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d448b1a7a73564b16e1542fe717dcff8840e2d8826f4a9d2c264853b7f9d9a5. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/ES5301662554.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b57235f9c68b803d099fad85db16350c660d0058b0754d970ec4a5abeeaad39. Chain 2 (Bitcoin): anchored in block 960509 (2026-08-01T04:30:37Z), 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/ES5301662555.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07b15077e8f8916e403d0fe29e797982f176c2c08f7cef4f6151b34a172caa8a. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/ES5301662556.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4161e8a0f0bd4542176c1afb312acb487a070e1bd34c0b08f376bff1e58ab13c. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/ES5301662557.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f9e05bf4b7b05be5e659703020758ff1252b00172effce1883af6240a07c507. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/ES5301662558.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54608edf3b58cd909bc5f2c1367709570e75f3c943c353e120ddb9e03bfcb69a. 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/ES5301662559.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbbfc369057444770441de8489d4c96e32c24757fb78dfd5e0e43c5da573c6bb2. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), 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/ES5301662560.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf83581078be2dc0d09ab3f6d0deb309f04754e3feddfc53af39b6bd3619dd2ef. Chain 2 (Bitcoin): anchored in block 960376 (2026-07-31T09:09:19Z), 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/ES5301662561.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd47e20d16d7eefa7d983fa630628134c3323fed798f8f1c4cdc7e1d30a6c9ffc. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/ES5301662562.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbbf3e90b4811b1d940fb2a33620bb22947b3b20de58732701380bcee95128f64. 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/ES5301662564.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96046e1f22fcb02e94567f6275a1335af94178f648ad3791af2f4ec415a61c43. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/ES5590601321.