Year 424 (CDXXIV) was a leap year starting on Tuesday of the Julian calendar. At the time, it was known as the Year of the Consulship of Castinus and Victor (or, less frequently, year 1177 Ab urbe con
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 0x5bd353dcdef9105bfb804dc45fe798e8af7b1d3520ebc1cef6fed7802eee5908. 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/09269d1a-ee45-4f03-8b84-296f36372a8a.json and https://artists.proofprofile.net/proofs/artist/09269d1a-ee45-4f03-8b84-296f36372a8a.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 0x59f741018fb7b810d7d709c9a7e3034dfebc12e34a4a2654986749f6ee34b9b8. 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/MXD781701058.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3587dfdffef0170eb0e3d96a8d7f555a3c11cd4f0bb93badf4e17a6be59336e2. Chain 2 (Bitcoin): anchored in block 957735 (2026-07-12T17:47:43Z), 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/MX3741300234.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ca0811c12fdf5a83288245990e9fa357911c26a91d51f3f4324d4c8016c5a2f. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/MX3741300239.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd42b26d58233f6846d3d4e374f19b3fc7ccf97310ab0c7cea36f56c4fab35901. Chain 2 (Bitcoin): anchored in block 958069 (2026-07-14T21:37:55Z), 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/MX3741500289.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3230a1041ab6148aa20cd7f8ad5f94f30f26c0929e3e91e06afbeb8821749aa3. 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/QM8E51400077.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f5fb1f92627a4f95a2abed0d24ea0c9e76c10fc945e222f91fe3fdeeb6ee619. 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/QM8E51400078.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b12dc3ac33fb5dd5760b9096afead8216feb59b68a07cbd1b584e6a9e02c063. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T02:01:41Z), 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/QM8E51400079.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x732f7ddb6942c8430b3b281d93dd084981917b53bde7f1613a3177bbec9e5fac. Chain 2 (Bitcoin): anchored in block 957747 (2026-07-12T19:35:06Z), 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/QM8E51400080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2919ecd404d0dd0870587728a1fa44bf53ed2752721ce14d9d707791c3d6b81f. Chain 2 (Bitcoin): anchored in block 958401 (2026-07-17T11:10:25Z), 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/QM8E51400081.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5751406b8220fc7a6c410d1b5c517244ebc7cfdaaaa16d99c70a0b14cf7e7f7a. 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/QM8E51400084.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x975ffe1a08386b42a82670b5ab862f5004ec0ca6a51f86d942e8b249b2f4178a. 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/QM8E51400085.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61a6f050f06f1260d5dc9e43f0b384f2c135d69d8d86891677b17e16014818d1. Chain 2 (Bitcoin): anchored in block 956861 (2026-07-06T01:57:57Z), 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/MXD782004532.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3271f03297e7307c81fd530f6cc1896bd8666fb0340d4cf9113ef984b99035c1. Chain 2 (Bitcoin): anchored in block 958965 (2026-07-21T04:29:05Z), 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/QZTV32382211.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6204b78eef5c2dc27db5bec36e53adf055a569a417c06f912d8dd2456788c80. 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/QZTV32382214.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37b0dc1b3fa7a7fa5437a6331a27e16f5cb3a8d24f9b59363a856ede3ad12460. Chain 2 (Bitcoin): anchored in block 958346 (2026-07-17T01:47:42Z), 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/MXD782200760.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b96628bc31233a87eb1edc862dcf87f6fa627a914d16af93be2acc67d901f9d. Chain 2 (Bitcoin): anchored in block 958654 (2026-07-19T03:55:30Z), 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/QZTV32382217.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb40d414e2f590edcd8408e07dd9a735b8ed8d85e162133b12cc3dffdd1a0ceac. Chain 2 (Bitcoin): anchored in block 958977 (2026-07-21T06:27:23Z), 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/QZTV32382218.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a3224dafc18ba884bd3fc5ebcd1a39d20e61d8adad8a38a6f5b6858cd2b64f3. Chain 2 (Bitcoin): anchored in block 957735 (2026-07-12T17:47:43Z), 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/MXD782300199.