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 0x24d5eb5c112661b9e2651c9cf58af7dca761dca947deb096111463d719c8198f. Chain 2 (Bitcoin): anchored in block 954533 (2026-06-20T08:57:02Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a60ab876-4187-47cf-94bb-5576335c9b0a.json and https://artists.proofprofile.net/proofs/artist/a60ab876-4187-47cf-94bb-5576335c9b0a.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 0x542a2935fa8f82295b1becefc12eeb0eceb7e5d0aec576adf60640afe5b21268. Chain 2 (Bitcoin): anchored in block 960294 (2026-07-30T18:46:00Z), 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/QZW9L2359407.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb58653407cca2c34877910d10b98534826b825e69e88e093b13c93b99ca957de. Chain 2 (Bitcoin): anchored in block 960383 (2026-07-31T09:50:37Z), 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/QZW9L2359408.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x213f882ce325e035f00ab6001a5fbcc3f68407f45a712511526d313642efdba1. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/QZW9L2359410.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26469b941c5a39ff9dbdf9fdd78d54bed479a086f54dfd1e355b26d28b369c84. Chain 2 (Bitcoin): anchored in block 960340 (2026-07-31T03:15:04Z), 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/GX4R52406320.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac14b36a54e9378c3677f87eba0a7353ea3eeab2d4ef297bfeee917ed514ba7d. 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/GX4R52463532.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad758b1dbd59095dc6a98a7d093d99806457aa13be5609127224fb24d3c40d95. 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/GX4R52464818.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf2ab55c8f1fa4ba77261a7cc461905020f2b31b664ffc30d43224baf54c4ee1. 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/GX4R52480958.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5fbea96cb3f96671de87bde83b0dcd3d50ece93bb0710164beba27979968b8b. 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/GX4R52409635.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x795b895a394698d8d6deeca85451c9c9eda4e315822f6b2ce5a1113ba2741d73. 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/GX4R52465348.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x137a9af7bbac67ef656cc271bb536a91a6679869b313717a7ac3bb4b80033298. 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/GX4R52415404.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b24dd7bef835007f4e7f5ebff240cbba2b00b3437d788907971ec221f250237. Chain 2 (Bitcoin): anchored in block 960352 (2026-07-31T05:48:30Z), 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/GX4R52426960.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed0155765c5ea7d570cf24c9a1233e982e409919502985e42a76e3f380807c00. Chain 2 (Bitcoin): anchored in block 960362 (2026-07-31T06:58:00Z), 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/GX4R52489519.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35916e31c05b6b5409af7c9b4fb61eba762efc8274a2d89f4320b1ace84b171a. Chain 2 (Bitcoin): anchored in block 960311 (2026-07-30T20:45:02Z), 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/GX4R52414638.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x788824a5b06e233c657d0d2908c20c271373e4ebea9392fe86b66adf290991c6. 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/GX4R52432047.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe795c1b12047f6f200696ff0faad2bb126edf87d21357d02ae005bfd5cf24c0e. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/GX4R52445059.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9132452b99e28b672db80e1369a1a13bdb2fb60d5086a69cd133da4a30dc053d. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/GX4R52496172.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdefd791eb5a22e017895aa6c3b61c697ac41609305bedb41e97116889493f466. 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/GXBDS2553112.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd074cfb3ffc75e38cd7f7e775b705e12496055fc665e4b76a088f6283ad9759b. 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/GXESV2558576.