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 0xea5dcec01fba83f99494567cfde7146b21763d9e41742a07d37aa23be0d51880. 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/a44ebe5f-4c0c-4f44-87f8-dace249f7f0c.json and https://artists.proofprofile.net/proofs/artist/a44ebe5f-4c0c-4f44-87f8-dace249f7f0c.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 0x5d03331ef20a047767f25c50ec2c57ca7a347f196a94c0c45fc9bcd158f3fd3d. Chain 2 (Bitcoin): anchored in block 959001 (2026-07-21T11:41:42Z), 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/NOX9X3748801.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf44e3ba93d98b8ab2c08d6d7cb711e8bb16dea08f3774fa6657e4ffc1113398. Chain 2 (Bitcoin): anchored in block 958594 (2026-07-18T18:05:01Z), 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/NOX9X3748804.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43d52ad0969eb3e2d9647fd366454a1475980d41441921ed601e5cd7c301b7da. 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/NOX9X3748807.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x819317f919b1717f87f4cac97abdfbbdd81ee33e57c4081ed943b49a5c50f810. 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/NOX9X3748808.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24583a0e25355430867187d33233829414edf313e3030d77ded945a28bb00b89. Chain 2 (Bitcoin): anchored in block 958670 (2026-07-19T05:26:23Z), 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/NOX9X3748811.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd97be6c5cc9ce50dbdc794e34e90849af8cd690299f547206edf3647e33f0db. 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/NO2W91301020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb1aedef9c38bab50c50bc7cf82c3d10f89d640e7eabb76097af4adf6f5158d1. Chain 2 (Bitcoin): anchored in block 958256 (2026-07-16T07:22:18Z), 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/NO2W91301040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04154b28a49f461ca5e575317ed266425938763cf19188f6e3f08e1d9e1fa2d5. Chain 2 (Bitcoin): anchored in block 958054 (2026-07-14T19:33:24Z), 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/NO2W91301050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9762c6eec04fb947ab34e44810cc6eb24e50dc0dfc069ec1419260b15f6ed7f. 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/NOCEM1951010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc85b02bf7f3bc8b73f3ec4a23732762f499063851cbaf4b00e43dfd332f56443. Chain 2 (Bitcoin): anchored in block 958673 (2026-07-19T05:38:28Z), 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/NOX9X3997504.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a1fbcc9c3564b20e65e7baa4e422f8d36c86644c0f0b100acb6c5352870a4e1. Chain 2 (Bitcoin): anchored in block 958541 (2026-07-18T11:37:54Z), 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/NOGTA0584040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf6e426258d4008fc6bb406980e7ae8e52ddd1416cadf6961ab19c725a9a7d98. Chain 2 (Bitcoin): anchored in block 959065 (2026-07-21T22:00:50Z), 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/NOGTA0615060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3756631ec593de445887976e9e07911030487e3ee499fc7af0debaad4e7edab4. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/NOX9X3717502.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x204bffa1077a5cc73a71e4d592f5e10e2546c89e056b2d54fc155f61a193effc. Chain 2 (Bitcoin): anchored in block 959152 (2026-07-22T16:23:52Z), 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/NOX9X3487121.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e32efc017fcd3dd184fba1a101b829d6204a1d7a5e6a14b4e6c0b0a63101178. Chain 2 (Bitcoin): anchored in block 960225 (2026-07-30T08:04:30Z), 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/NOCEM1809230.