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 0x1ebec2b90eba0682f6f2d7dbb63f244bdf8695521696e786b68d891f1f47d270. 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/e8e6d498-7ef6-4131-8151-27ad61c98f36.json and https://artists.proofprofile.net/proofs/artist/e8e6d498-7ef6-4131-8151-27ad61c98f36.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 0xb8a7263736505b94cca3806e66b004398d0d1043ef84801e5777413c62a41bc6. 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/QZAKB2155364.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18c6d9fe20bbb81c80db162e6057c03872a979d695fc784414753b64d799d92c. Chain 2 (Bitcoin): anchored in block 958905 (2026-07-20T16:14:34Z), 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/QZAKB2165657.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e25d0fcba22beec6435e1c268d49770a4584953e155c9d64e02d522af6c36dd. 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/QZAKB2165655.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e25d0fcba22beec6435e1c268d49770a4584953e155c9d64e02d522af6c36dd. Chain 2 (Bitcoin): anchored in block 958383 (2026-07-17T08:20:01Z), 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/QZAKB2165655.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ccecbcf53681a8a1ee04b8059672efea5caaa71c68d7caab5a61e22abb13d6d. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QZAKB2166692.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb574722369af0541baa83ccc4c086e4b3db3963912d91232f285bb67995fbb08. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/QZAKB2169716.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb574722369af0541baa83ccc4c086e4b3db3963912d91232f285bb67995fbb08. 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/QZAKB2169716.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc8eeaf0da967320a3ce45e974cffd5091bafa3e16546f356d2209e667f4e96f. Chain 2 (Bitcoin): anchored in block 957782 (2026-07-13T00:52:48Z), 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/QZAKB2319534.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5711e5ce73f00c85de836dcaecf1ee301469cd8aae56eb419b191e6485a0494. Chain 2 (Bitcoin): anchored in block 958917 (2026-07-20T17:53:56Z), 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/QZAKB2352248.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92675c631c076f6abd1b4ca2375ed5e559b3c48bea971153323c433e6641188c. Chain 2 (Bitcoin): anchored in block 958857 (2026-07-20T09:45:25Z), 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/QZAKB2358553.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7417082e04376d8172fb8a730b5117012cc24acd81847ef4c497a9dfd6528268. 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/QZAKB2373148.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d7c941a320686f2bf3c15464099883a5766c55ecb113e7d79fd0f934d947f0b. Chain 2 (Bitcoin): anchored in block 958436 (2026-07-17T16:42:22Z), 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/QZAKB2373150.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe263579c01eeda97c9df3a9cba5a1df608094e7dccda66b22ba32683d0275740. 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/QZAKB2373152.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03a726ddadfc81125cb549037ac5c256b0a750f3896dd7f1a970e1458833e60d. Chain 2 (Bitcoin): anchored in block 958153 (2026-07-15T12:03:04Z), 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/QZAKB2373154.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ebbf94b6838030872d8761c4f4951c96ad3e51e3bb22b2985cc536f291f5822. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/QZAKB2373149.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63b29eb45949516089df2bb16d923619d1a7850208b4b4385e207af11c06d34f. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/QZAKB2373151.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x880365e1e7c6d7e070435fe7a140d100ea33153426d20d707c8947fe25360848. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/QZAKB2373153.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64a3f1e30c5237d69130b5e7593adb1d309919d54093f38e592a3bc46dd6a42b. 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/QZAKB2373155.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5238e9719014a21874b7a85e7ec4a14ec3cddc9844aa42913c9c54914559359c. Chain 2 (Bitcoin): anchored in block 957546 (2026-07-11T09:35:53Z), 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/QZAKB2439178.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x792c23e977004ff10551972969bd894d7b8e2d5062bfecf22d3699ba4ff87e98. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/USAT22313689.