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 0x31ddfa213d6e7e664c86e155cca7081427dcb9e8b80b0dcc246453c493f1c269. 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/96f2bc02-ff91-47c1-9bf2-1365c3314af9.json and https://artists.proofprofile.net/proofs/artist/96f2bc02-ff91-47c1-9bf2-1365c3314af9.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 0x165c7f7f3828e4969f734c6488adf49c7c27d04ecac3ee76853b8cf2cd1190b3. 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/QM4TX2065872.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x813e4110fcf9767b65d5f7d82df4318e71349cf3275a0f5c02747004be74deff. Chain 2 (Bitcoin): anchored in block 958774 (2026-07-19T20:03:27Z), 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/QM4TX2065879.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d406d2b3e82237c1890f5675bb43216e50cb201d0b4b96898a2f0562ab7832f. Chain 2 (Bitcoin): anchored in block 957851 (2026-07-13T11:26:33Z), 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/QM4TX2065880.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1db13f16a6f1ea70ef06f69522151b68291939a947192d70246fd408dd2d4a15. 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/QM4TX2065906.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe43219969050662ee939dee800362c4d39a23bee5768e826f0cfc07d5986bc3e. Chain 2 (Bitcoin): anchored in block 958268 (2026-07-16T08:56:51Z), 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/QM4TX2065907.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1cf36be636c69f4974c6477d3cddf5027408daa43323157f43c3ff5a3e4afab5. Chain 2 (Bitcoin): anchored in block 958738 (2026-07-19T13:10:36Z), 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/QM7281970714.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e9e277f6d16f802add4ab464555d7aa7ca45749354247a317d7d93a51677546. Chain 2 (Bitcoin): anchored in block 958547 (2026-07-18T12:44:05Z), 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/QM7281970716.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7f63d8ed45706f6b6769df0fd264a8b6105ef2c6c15bdc279b01798cf983d90. 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/QM4TX2370296.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a35865ce7c6fdcfcf37969f88f1df927d1ad0bef555096462ccf2c656eafe80. 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/QM6P42322347.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc029ca2d05ee7be7c74ecc6d907f093e5468b4dd6b6d9b00d0ee13d9a12fa48c. Chain 2 (Bitcoin): anchored in block 958067 (2026-07-14T21:26:15Z), 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/QMFME2300914.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2840f84732c5ad994888d7e16ff617d6d77c9bd41d526d44fc3bf197f77ee0a4. Chain 2 (Bitcoin): anchored in block 958746 (2026-07-19T15:36:35Z), 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/QZZ8B2431880.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9b55a6d0dc966925f0e1408da7f96dd6ec86e1f332ddce01d6a94c2fde9ecff. 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/QZTRX2539656.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa23dcfe87285c915b6c4856f1acb2e6a425cef30d6b69ccbd2b764723140a068. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/QZWDE2509889.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9b55a6d0dc966925f0e1408da7f96dd6ec86e1f332ddce01d6a94c2fde9ecff. 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/QZTRX2539656.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc15e9f87c93872832a915dbb3758cb97c79e09b53e0de44da1a9e66455ca26c6. Chain 2 (Bitcoin): anchored in block 958805 (2026-07-20T02:22:58Z), 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/QZWDE2509925.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d6d316e56a42b243c34ba0ccde9f7d7108c895c70a8148eb71dbc07012c82fd. Chain 2 (Bitcoin): anchored in block 958585 (2026-07-18T17:05:16Z), 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/QZWDE2509937.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x044c6e706bc10d1b914845615a1287364e22df9cb689636a53c75c82b0e46d2b. Chain 2 (Bitcoin): anchored in block 958242 (2026-07-16T05:02:52Z), 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/QZWDE2510050.