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 0x5b7610b7a6a9bef5c27136f2ae1336c3bebf774fdae5cc515edbcc69e621120c. 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/04e67bf7-b459-4b49-80b1-abdfcac1848e.json and https://artists.proofprofile.net/proofs/artist/04e67bf7-b459-4b49-80b1-abdfcac1848e.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 0x8dc1b5dae1c1b2d1faa650212370e9eb39361a1ac41d1bafbc22048febc7a4cd. Chain 2 (Bitcoin): anchored in block 958975 (2026-07-21T06:12:52Z), 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/USZUP1012167.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x466723d8fae46b3e7a166c9775880067e710ba13cb3826d3a6fff53a2b97e57b. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/USZUP1012168.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7c65eb4c9072b136d34a86c257d3d1257dff36163a1bcb0828b69847519167b. 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/USZUP1012169.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec019faf37d228fe786c017634e87ef923a10399ce963c09a9067a70be37f93a. Chain 2 (Bitcoin): anchored in block 958975 (2026-07-21T08:27:27Z), 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/USZUP1012171.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa136624f1b3088f19bc173a0350ef6b5b17ef571e7787a7f71eaf76294943896. Chain 2 (Bitcoin): anchored in block 958170 (2026-07-15T19:14:01Z), 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/USZUP1012173.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8dc64ff43596846b40c761eda570a092a7cf38bc02f2e9e0f9017c1ec7dfd223. Chain 2 (Bitcoin): anchored in block 958576 (2026-07-18T16:22:28Z), 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/USZUP1012152.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15a0303667722da11f4cf75d5529c811e8666baefe04f9027ad468e2dc891e76. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/USZUP1012138.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1989d0e2fc1db1f5da6003466d0dbb201089055c9d38453bfd9115e7f06ab12. Chain 2 (Bitcoin): anchored in block 959094 (2026-07-22T03:33:16Z), 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/USZUP1012140.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb18efddbdc8e492663497e3a9db543222315369801ae0588a84037140e74975. 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/USJ939770086.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd25086ba404e907c8156c18f4e235aae52c67350a452fab69e9dfc699512761e. Chain 2 (Bitcoin): anchored in block 958846 (2026-07-20T10:57:02Z), 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/USJ939770087.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x405334179fc94fd9abbe92b3b7b01dd83960c14130ace17e8df9b7a8b033f387. Chain 2 (Bitcoin): anchored in block 958228 (2026-07-16T05:26:41Z), 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/USJ939770094.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x728e7cdf67082b4e4fe11ab7ded060341574c00e44c7af5aab89d944dc9b4daa. 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/USJ939770095.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1b5b38052ef082bf6c3f8dad36578cf22992bbf5fc6d1388ec4987752402d58. Chain 2 (Bitcoin): anchored in block 958074 (2026-07-14T22:45:25Z), 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/USJ939770096.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2f0e5cb1e6f2bb938c7e3e2b2ae8ada24f466343342bfcee2c6a15255694f69. Chain 2 (Bitcoin): anchored in block 958083 (2026-07-15T01:50:31Z), 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/USJ939770099.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa39af7ebde73221cae339cf7c2df18ba0352876797dc1ab2cc3b6b7d96d3abc3. Chain 2 (Bitcoin): anchored in block 958517 (2026-07-18T07:54:29Z), 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/QM6MZ1503711.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5430da75344f2485b9f2b9bdf5a53e0ed76028a7a8cb16df8c9f2b587d85bb4d. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T04:51:11Z), 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/USJ930070260.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9df49429eb5d7c4e4553c460240428bd472e98cf3703b220fa2b237fb7c3bb69. 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/USJ930270168.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43a54a7b09b5752978854408844c3d565bc538a50cdb913fce0b5883c1b8c844. Chain 2 (Bitcoin): anchored in block 958834 (2026-07-20T05:55:47Z), 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/USJ930270173.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b677ec7b39bc63b626e96f0aa414c9dc6bc45c8234ac5c3f26b27e87b415f9f. Chain 2 (Bitcoin): anchored in block 958776 (2026-07-19T20:11:59Z), 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/USJ3V1123392.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a3b19c49a407685742e386b1a8ae280c8a85b333fe50f967d77658084c32295. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T07:37:22Z), 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/USJ3V1123393.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8731137f6e1f6ddc19fdbbc12be0d7e861c99a920f8898c2f7b8e691a0c22a30. Chain 2 (Bitcoin): anchored in block 958825 (2026-07-20T07:32:20Z), 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/USJ3V1123395.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50f8077c87b4ea8575630bc591695421f488bf99e22034780bc4d3800a17a7c5. 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/USJ3V1123398.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef14ba9fa5636a6ff66d61eaaff16c6e4fe3bb45a78021803866acca481e49e8. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/USJ3V1123400.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7515905be1874cdb56cb13b68c2f371212be222717d5d7821ea7c81a58f95425. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/USJ3V1123401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a37d2fc671ddd544c76c2ee013892918c9183241ce2029ac5df4eef1478e96c. Chain 2 (Bitcoin): anchored in block 959069 (2026-07-22T01:02:51Z), 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/USJ3V1123402.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d60f931ef5329dec98bd38c19a8e0844476df0a518d6fdd2ba90fa50ede9902. Chain 2 (Bitcoin): anchored in block 959073 (2026-07-21T23:25:37Z), 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/USJ3V1123405.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15bb282791e9fd160f8ec72ef43c2771229d830742347ed9e20714a1fd6546a3. 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/USJ3V1123406.