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 0x2b3c3b6591527e6450e185e467a6f02ea64a0701b337b929fd5d566ca4c99c10. 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/982c5e5e-0292-4842-873d-9db32a3cbb23.json and https://artists.proofprofile.net/proofs/artist/982c5e5e-0292-4842-873d-9db32a3cbb23.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 0xa813cee204e1df241256abb77148f7e0b98ab169712b3bfba607c663e6dfe05f. Chain 2 (Bitcoin): anchored in block 958420 (2026-07-17T13:33:01Z), 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/ATBK71202004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c000aecaabc7df0e450580961666836a8da41785a474665428baf498061bcb6. 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/ATBK71202511.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x332687ff974a1631c1cc0141b09b51b3dcb3ace55380208bc453533f8ac90221. Chain 2 (Bitcoin): anchored in block 957774 (2026-07-12T23:51:20Z), 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/AT1962500304.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd73daca17a56cc5033b19d2b86853b84c73a1182c1afc3d460f53ee17708d14d. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/AT1962500305.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba71e2b501110ab9568686beb583ea40b62bea2ccf8fa5667a3146867d9591ae. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/AT1962500306.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6eb970ff431b9074498e2cf41489cf2499d2afb80e64550a8c6da29736813fd9. 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/AT1962500600.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x964fdcc4ed1d970f8a100e59647e7be35f4ca8e2104154207450ac2d9482b307. Chain 2 (Bitcoin): anchored in block 958853 (2026-07-20T09:11:53Z), 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/AT1962502320.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf11d463bfed1348b852e2775cd0930a7a5d249be4d59a8565e7145a90ac975f8. 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/AT1962502329.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7ee0e19bfc7a223a367e4c2eaa667a1a80c6be32c3a4f439cb4fcb796f3fa04. 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/AT1962502630.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9e7e4fcdcc5c76d5f3764066ec216bbb39c2429c87817405c0dc654849d6814. Chain 2 (Bitcoin): anchored in block 958448 (2026-07-17T19:49:21Z), 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/AT1962502631.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x908beeb4ba76edfbb2c764fbdc5b903fadd106f27680967242fd7bf70cbf3b83. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/AT1962502632.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8cfb69d0788f3f79c363ee349793e1adf51dd20fb4c57f3d4c0b4f9ae1fec23. Chain 2 (Bitcoin): anchored in block 959137 (2026-07-22T14:03:35Z), 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/AT1962502633.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca6fbe3d51239ea21e1bd7fdd3c301d8a918c3395cf32f01f58ce545347d9f80. 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/AT1962502636.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f7ab57112e92dd08b35400ed0edc6489cb394edfcc78b4aa2495c01918267b4. Chain 2 (Bitcoin): anchored in block 958392 (2026-07-17T09:46:31Z), 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/AT1962502637.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d67fad8d76cd005fc3f4999ab4c409fe93d7d7b3310a8f83de350276dd50564. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/AT1962502638.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x808edefe7443dbfd436529777bc81ab606a62a782f737a34c724022b3c260e58. 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/AT1962502639.