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 0x6305d285d973fffb737c8348a6ad81c9d2a04aaf96d0f73b56791668bef1ee6b. Chain 2 (Bitcoin): anchored in block 953803 (2026-06-15T15:41:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e48e6f88-be15-4298-8835-244eb05b2024.json and https://artists.proofprofile.net/proofs/artist/e48e6f88-be15-4298-8835-244eb05b2024.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 0x3975227fc6ed63a7f15a8e85891c58215dea2c4b730884ffa975063c9749a249. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QZK6Q2445935.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b02290740e4b04ff78fa9dcfb438d54acc4a890decabc4d5ab8697a79297ad8. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QZK6Q2445936.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc329bdc09f419fd966a170e84a40c68db64b96d0cc987b43c68aaaec6025129. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZK6Q2445937.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb83753f2edb2800248df4e04378ae52bc44e96002c345190aaaf50322999316c. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QZK6Q2445938.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca070c6d36fe7e20fc6551f77d2fae642d99532ad9c340c5cbb62c2d257a777b. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/QZK6Q2445939.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c2eef0a223d1b12973dcc60638ebdffbbb051de313ee89d3091f1ca87c7fabe. Chain 2 (Bitcoin): anchored in block 957064 (2026-07-07T16:43:08Z), 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/QZTBA2210725.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45b5fe5b02a29268c96227d59804c7500b374135fc48d481c9a9cca7dade5ca3. Chain 2 (Bitcoin): anchored in block 960240 (2026-07-30T09:57:33Z), 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/TWHZ72000001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30ba7c5b2377c54030f38cb46aec0e538f55b5161ab280072b8290583f56b981. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/TWHZ72000002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5eb8b8d95ecee81bca5dce79ae77f7485712f8f1b356b2c559d3a587ea790544. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/TWHZ72000003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xedd893baf81727227bcc53d5e68e9fe1f4ef9de00c847d772bf3fb4bb43d2f1e. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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/TWHZ72000004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42359b2b5a786b46f36c3ca6b383f47cc755696a3b2b6b1bfd0ced4b8fef2c5b. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/TWHZ72000005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x216308ea7d847e21b482baa527898e36f082b2e7ba2cdc52d71549b79cdbde27. 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/TWHZ72000006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19e260aa1f6732c18f201068fc1c4522b75ec91162691063017ad46641e24cb0. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/TWHZ72000007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37e9ca4a34d362ba2d6569e6307ee85806829c2a6bed8685f9ff434fb9806fa1. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/TWHZ72000008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x231124c6ef9b6dc7548c4db1f134e241803984f738aca9db2c5814a596cf26b3. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/TWHZ72000009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe17fb612040c86c4161a625fad412e60f3b902aea6ab5ec5ec332949bdbdf6cf. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/TWHZ72000010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94176364c7eff829e9b2cd2aea238852f76e5130918ed3a5fb7d2ee5b50c6698. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/TWHZ72000011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec1acf673b839dd5b8fd862d85ec08077bc1bc2d7c73c01eb1404f6eb4b3c0fb. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/TWHZ72000012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5bbd515a7f3aaf8185151083069611f9776ca744e009379d25b254a8d86f97e7. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/TWHZ72000013.