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 0xb30b1febfb7162361129de76506066229a5c45c76ab80cbbb875bc8ba379d5bd. 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/d2a073ac-53d6-462e-bcb9-14b405b1fc99.json and https://artists.proofprofile.net/proofs/artist/d2a073ac-53d6-462e-bcb9-14b405b1fc99.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 0x128e9880cec35464260ad6bc7377e1b6f8b4c45f221cdbf82ef3b79dce971186. Chain 2 (Bitcoin): anchored in block 958627 (2026-07-18T23:33:54Z), 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/USD2N1000008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0366f970c895077206928a4d9c8ea1f19718078f398fb8edef919220052ebc37. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/USD2N1000009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b586801b0a178e175a26bd1b47376ffc03cc175f649011186a117105d13e288. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/USD2N1000018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa681ba0b2faaa29ea6d5d025f746600ef4a93719927ab1204554e555c3461c77. 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/USD2N1000020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a402e308073e2631455c64a9e9c49425253ce5d8bdc8436cc70ef779ccf7bb5. Chain 2 (Bitcoin): anchored in block 957882 (2026-07-13T16:48:10Z), 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/USD2N1000021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d13b11dd229ca0791c89d42c252aa00e166be43140eb4e0a9dc021305cf0dd5. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/USD2N1000023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0db54abd943388a2600aa1312b4f8fe01beb2fa3dfea51210b1597f464c978a. Chain 2 (Bitcoin): anchored in block 958631 (2026-07-19T00:50:09Z), 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/USD2N1000024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00c95f05f93f4aca7785d8e42c80aef8b73a223175655999bda38a0fce9779d1. Chain 2 (Bitcoin): anchored in block 958627 (2026-07-18T23:33:54Z), 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/USD2N1000050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8872b23f234b003edb9f80c810fd65c431ecffe860ff9e5ce67725fc80e0b5f5. 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/USD2N1000064.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf80be89051cf72805a5aac32642a2f2b2985c5a946db4d426dbee07fd8548ff3. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/USD2N1000065.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x353a3b3b98cccb40035794154e971cc3bf07898d25acd83112d3095bcbe8edc4. Chain 2 (Bitcoin): anchored in block 958506 (2026-07-18T06:14:51Z), 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/USD2N1000104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf20934b078d0424df4d85cedc61b91e188db93e5023af19925cad320bf5f442a. Chain 2 (Bitcoin): anchored in block 957866 (2026-07-13T14:54:25Z), 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/USD2N1000107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d0e5cfe7497cc23ec6bdf778df8f6321228f9a2afee80c1cad2c443c9000847. 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/BK4DA2323540.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85471fe99686cd55b913eb064c2c4ec67f6a6dadf6e16bd2713e18ad704871ec. 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/USD2N1000123.