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 0xa1f5c95c95b33e6f98ae6772e459a26951bce170b4add923c3161c3db89a2276. 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/f04f124e-8f0e-416c-ab53-19b5d6c37bfb.json and https://artists.proofprofile.net/proofs/artist/f04f124e-8f0e-416c-ab53-19b5d6c37bfb.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 0x38a119ab5187fcbee808f5fb4246f50950982846767cfe6d50a5c9e1aba341a3. Chain 2 (Bitcoin): anchored in block 958388 (2026-07-17T09:14:21Z), 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/TCACA1452778.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe80dc112034ed1d9066f3148b452c902fb5da30a9de15550622a4e4e9a57bc25. Chain 2 (Bitcoin): anchored in block 958263 (2026-07-16T08:19:47Z), 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/TCACA1452781.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5979ae9ddb2936de96e52b1e760d52431d63c5c1549708c722eda3dae861f3f5. Chain 2 (Bitcoin): anchored in block 958991 (2026-07-21T10:04:40Z), 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/TCACA1452782.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95e429b0f54f3318b308d63b55a11250d188725c1b356771f3f6b4ecbef2b235. Chain 2 (Bitcoin): anchored in block 957750 (2026-07-12T20:39:38Z), 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/TCACE1528204.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x825a17eec87d41d1fd09011ea9814c80283d1b20f7db212b6eefb73180d48315. 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/TCACE1528205.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1d934ca9ad08040c955f0c7aea46c43f41db8e314520b6e9e48f2e928e63e1c. Chain 2 (Bitcoin): anchored in block 959155 (2026-07-22T16:43:41Z), 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/TCACE1528189.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x197dc88543d73155004946065836e313116a20ab403124688a8a0abfb9aa25da. 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/TCACE1528195.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91c3575e4d1081b7c32f150b481684f1b78d1f7cd926a8f48bc8c8b680bb4447. Chain 2 (Bitcoin): anchored in block 958800 (2026-07-20T00:52:19Z), 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/FR10S1666274.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe56c3f548bbce7b622aaf5d52ba4af5412c994433bdf6de6c0d7179d0398516. Chain 2 (Bitcoin): anchored in block 958980 (2026-07-21T07:04:12Z), 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/FR10S1666273.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38d05c9610fae8a5c01e675ec1988c2c53b83e5a4d2fafc766c59c5582fc82e2. Chain 2 (Bitcoin): anchored in block 957750 (2026-07-12T20:39:38Z), 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/FR10S1666275.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9b1a08b9468045ac02b159fde5ac921e8566cfa2abd28f69df1346ba077fa07. Chain 2 (Bitcoin): anchored in block 958561 (2026-07-18T14:22:01Z), 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/FRX281700360.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9949511c0e04239b8e4f1061ee4f09793b04140952ada6bd385cbe6da43e3d30. Chain 2 (Bitcoin): anchored in block 958716 (2026-07-19T10:15:55Z), 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/FRX281700363.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88498770828ab4114a1e89f44acb857612c33bca7694c7e9e6f7cd0c9126d1fa. Chain 2 (Bitcoin): anchored in block 958600 (2026-07-18T19:24:05Z), 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/FR2X41952633.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6282d55839b27a809e60489521280e37fd94de0c1f936b9b28bda7f7789ba9f. Chain 2 (Bitcoin): anchored in block 958407 (2026-07-17T12:08:48Z), 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/FRX762027868.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbde25a9dc7323129004eda38c493c7c760eb3c67cc45481b189beb135f03fa81. Chain 2 (Bitcoin): anchored in block 959118 (2026-07-22T10:01:58Z), 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/FR2X42243685.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb52da58a2081513ac71c41f99b5a612920a023d13c4bc980c121d01896bb7199. Chain 2 (Bitcoin): anchored in block 958349 (2026-07-17T02:28:59Z), 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/RUA1D2256249.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5cb31c9ebbd6403a76ccbd5d856e26d1aefc82c8d6761a18470120758986de1e. 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/RUA1D2279616.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07f2b6af022f726c3b9029f30cbd5bccd5ca1c2c4ace06ca665307a5e3cc2b9c. 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/TCAHU2473122.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf774a92117ecb2b56e79c095b462dba0ea72d98817072a3ec53e032259dfbf7f. 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/TCAHU2473143.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63a65ee2364993b6923e3e3831d5bdbb113ff6bad2e47969f73baec6d1ac622a. Chain 2 (Bitcoin): anchored in block 958455 (2026-07-17T21:28:36Z), 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/TCAHU2473195.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x730d9e0ef6d632344f96aed604b483a85881ec860144c12344b2f67b2821e9ae. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/TCAJJ2595120.