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 0xc2a9b01f2ebcb90ed0a4ffbfc8f51e1ebbc758f74149b97800712e582e517000. 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/fafab051-6c79-4cf9-a6c8-3c96c49672e5.json and https://artists.proofprofile.net/proofs/artist/fafab051-6c79-4cf9-a6c8-3c96c49672e5.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 0x303d5ed93443bc03fb64a45d2132b17e3952ed15c4b9b0947f8475b2a8f73f2e. 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/ZAGW32400001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x497277d3ca2af7f8410d15974c78b17ee94cc92ee3949374de0dc7e4da38c262. Chain 2 (Bitcoin): anchored in block 958134 (2026-07-15T09:14:08Z), 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/QZHN82567934.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4dbe046bf3e24fdc3f65510842779cb7eab6f4135245067721fa68072ba3cc9. Chain 2 (Bitcoin): anchored in block 958935 (2026-07-20T22:08:19Z), 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/QZK6L2585403.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b5da08d3998b43a7c592464727a6c0bd6d96646487b7087f7e6000ec49f4e8d. 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/QZK6L2585404.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x229a2f89d36beb4942445c76394f77421aa1b8e6cd16d538ef342e6dabd7ec20. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QZK6L2585405.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x489be6c257d59f4db588fe75e917a1e46c099560ea9692e25f7c3e09a957b590. Chain 2 (Bitcoin): anchored in block 958378 (2026-07-17T06:45:39Z), 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/QZK6L2585407.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b1e97476a3a9e7032160ddcbf11c260bd0296f031b53d194793ff3f98e967a1. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/QZK6L2585408.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4307f046e04ab81fd9bd10da058d12bab1652d3842d2d0935ff7ea6012d61ab6. 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/QZK6L2585410.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x719493d62b6a46ee5d7554f3a898e91d4d1d12417849fee2c0b10a39f3142f33. Chain 2 (Bitcoin): anchored in block 958329 (2026-07-16T21:48:38Z), 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/QZK6L2585411.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f7a147480fa21f9177d58e9d412af7361f08c616bde2f8d5d6003502cc011ff. Chain 2 (Bitcoin): anchored in block 958468 (2026-07-18T00:27:51Z), 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/QZK6L2585412.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x303d5ed93443bc03fb64a45d2132b17e3952ed15c4b9b0947f8475b2a8f73f2e. Chain 2 (Bitcoin): anchored in block 957061 (2026-07-07T16:07:00Z), 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/ZAGW32400001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9dbba1afd5150e5320061504ef00426a5cd8ed575203a976f3d63e4a4d553d7d. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/QZTAZ2523970.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b5ed8507e9a4faa31e9046e043d55d4ec57be308939b491cfbbc0bbd5c7bac0. Chain 2 (Bitcoin): anchored in block 957043 (2026-07-07T13:52:39Z), 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/ZAQF21800004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb38ba0f70d0dcc411b3b3f992cad255a541731cc8c9f6782c89fce6baec54d8b. Chain 2 (Bitcoin): anchored in block 960163 (2026-07-29T23:20:38Z), 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/ZA56E1900016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xebf83a07ded7d32a6ecfba9c45fe176882a833a649c684e93910f16148c80291. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/ZAQMT2000036.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea2b89399f6a5bea92106020c894363f8eccbf919f38471f40fa8b7c5189fa73. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/ZAQMT2000003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69a95c2d89e23d0ac1d72f58a46f66d52ae514ad0a5c49db1941af582a527df1. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/QZTAZ2292822.