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 0xf67f71b383e923b1e87911399279c25a94fa6a75d5bfd06f89f877046bd44989. Chain 2 (Bitcoin): anchored in block 953657 (2026-06-14T16:43:25Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/4f3382d4-bf21-495e-b3e8-04c6a9d87f75.json and https://artists.proofprofile.net/proofs/artist/4f3382d4-bf21-495e-b3e8-04c6a9d87f75.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 0x0f1b365f6480430c127b18e9b9705f0e15e76acb65d30250385d04beab79e40f. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/TCACI1566403.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2f5fcc262cc6a2b6fe38211a02590af12c247c0d2ae19a9abf93326acf219fe. 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/TCACI1566404.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d19b02afb1de6a6d4cc79f905f7c9a98dc6ae0976d2d77453a75fac713336c7. 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/TCACI1566405.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74febc152f8cb4a508144ee4232fb7a753bf48b8fe5688ab6eb6b6ac783df69f. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/TCACI1566406.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7afd86ab5753f0ae4881929ccc0db5d5698b09919daf555cc42a6f5c7e9a9b72. Chain 2 (Bitcoin): anchored in block 960419 (2026-07-31T15:20:33Z), 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/TCACI1566407.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1347e0021aa1601f19f31a27487f2953c0cda580ad0c3b62e40f085d48e1430e. 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/TCACI1566408.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5001d787c7a66d7cf0dfab57e9d6752f93eeee6df85231318d1a3d1d4a7e263c. 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/TCACI1566411.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x085447c269dbe7e4bc338ffd6ad5483f4cddb2159690190dad47b7217991de67. 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/TCACI1566412.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b304c1d7be00b69f7a04cdcda705ed2131343aa103cf8c4fae02b239c2b2c66. 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/TCABU1472530.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99d8b7c58b3551789f53f16e26cfef5ab929f11e5d40086235a8dc89b094a554. 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/TCABU1472535.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc817cf9c9da22fbb2a5dfdcec28a4eef13d1031f7fe4d725d0cab2a2f42fa906. 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/TCABU1472537.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf98d7e6153919cde773450b2f0ef7a487cfd923321e36e1bd40d82cc6ef17155. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/TCABU1472540.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc084c5ba69b0ba4aee69b3e1eeeaae960e5577ec90c00d939c9df2230817ec0e. 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/TCABU1473094.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90ba00218fe0d065d95b7fec5064e853ab6e1cf344fb3264cfb3f711e6b2a5a8. Chain 2 (Bitcoin): anchored in block 960337 (2026-07-31T02:51:48Z), 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/TCABU1473096.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe20bd05af69c8d5f6c88c4883efa785cfa6b746c6b5136f9679904186338bea. 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/TCABU1473099.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a93e81f2829d2c50bd2f734ce1998d17eacf9e326527995763fd7f7d0ae539b. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/TCABU1473101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdee4570d5004a16cb16669b28db47c1b86a02cab8b0e0818b05ea73a2b5eec8c. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/TCABU1473105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4331d0bcf528048804028973f53cb3e464a27c1fc7fbda95b793378111906fb4. 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/TCABU1473107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d4e2449e10f9add403212133b0180b15deb4203468f1d0cdc35c3af2ac9a7c9. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/TCABU1473108.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xffbde5bb0f5bf8789ac91984f9ad835abf9dd4b9ba665d5b07ed679722076968. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/TCABU1491798.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f71a9f70638f8b06bad3d0b76393e9b342d30c1814833c49e6a206da797a48b. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/FRX762492171.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23865a834ffa2a07a277caee2e2248f6a2c97d678367fb8fa9f33e611fc0fdf9. Chain 2 (Bitcoin): anchored in block 960485 (2026-08-01T00:10:46Z), 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/FRX282405464.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e6332105ee4c3b7b13ab79170ec281375786d8f4887ebbca2a80e8fe05b9f42. 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/FRX452269750.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23865a834ffa2a07a277caee2e2248f6a2c97d678367fb8fa9f33e611fc0fdf9. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/FRX282405464.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd05bbbef8467f050728e5e70e4f2a80fbf6c922f7add0d1273dee8b5640fbeed. 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/FR96X2453973.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x090e8aae9215c5d0851ebd3cd20d77ae88405d456635908b74bc1710d0c5a3f3. Chain 2 (Bitcoin): anchored in block 960150 (2026-07-29T21:51:49Z), 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/FRX282241893.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5607f68c35f9797973d503751940ec60c7d3770187654cef4ce4f58d5f2d59c. 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/FRX202232371.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8356f2b0f170449ffa3f4dba70db8130d020ea81996eec9c2a2367dd66954799. Chain 2 (Bitcoin): anchored in block 960337 (2026-07-31T02:51:48Z), 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/FRX202201333.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3df5a329c91cbf752ab6b637bbe4f9131d3ad6901079eda3faafb713922eaa38. 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/TCAEU2006732.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f01d3f637c161a11c877e0d1bfd48b83757c8976a7a44d81adec0909e9b8e6e. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/TCAEC1941284.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca8374196dbe999dee921f7be61fc1aab6913f84b76b934ef6e39752e7f90b47. Chain 2 (Bitcoin): anchored in block 960247 (2026-07-30T10:42:33Z), 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/TCAEC1941246.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc85686e046d6d6f16f5de8b51bd16ad5d0251473bd463d4b2f2d4fd78d83af3. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/TCADO1845331.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3bd506530fe8b4527c88b318e03e6f22ae7fd3151656169e0cc3287dc7edb62f. 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/TCADK1755359.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e6b683db27b4c6592d6b1436891be78beb331adcdf1dfff2cb6839d53385687. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/TCADC1704899.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84e69ee378da6b162624860e79921d6d618c14badede7f4f59eff0f3fb9651cf. 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/TCJPA2469773.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x138dee99480bc147b0b44e7ce7249d4f99e4011252b32f23ed53231e146ef7fc. 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/TCJPA2469815.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x112383083e765f7212fc8922e68b705be02c1bcc19b748c86cff8813e7518d91. 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/TCJPA2449186.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc504866dd29b70c5897cc5af2a57afb0f35ea95d42a5904615cb4e4bbdb78519. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/TCJPA2469821.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x112383083e765f7212fc8922e68b705be02c1bcc19b748c86cff8813e7518d91. 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/TCJPA2449186.