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 0xebbcd6dca43891fe6f90754a3ee8b9c3ba13838c366e0a8d4392e40f0c5f1ea1. 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/5ac36d0b-5fb5-4ea6-b3a3-b05eb08d3436.json and https://artists.proofprofile.net/proofs/artist/5ac36d0b-5fb5-4ea6-b3a3-b05eb08d3436.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 0x73b5875760febbadf8660a19acb6d8f4aec5f510e1b92737830caeec297b2166. 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/QM6P42200312.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd74a0d91bb002aaa05eab0f5d7f94f02f41798a94b83130b09459f6b2a114f3e. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZNJV2188682.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9a53a64e2f4f706af743beecc760d335ddac1c7f1477bd364e5de7b1c8eafe9. 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/QMDA62339826.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d63f3065d9f44ea7f96fba55d1b274f2b8234bfabfca45cf61779d8be7efd0b. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QZGLS2156127.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71d8ccc3102af6f29a2c5d96fd40756e165fa38740b3b7fabc93c4da698e977d. 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/QM7282191570.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa51a166aa28d6e964dbadbc7a0851a651614e81d636fd1a45db4a6bd82831d8b. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/ARIXB2401102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ed7a4b26a4e45ee76a394899db3e7d7f9eb4510f37d38c81cb63d3674e5d50e. 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/QMDA62238741.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62607896457281537dbe5498806940433f97236557ae6209eba2eb87b9e4e3d3. 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/QMDA62268734.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f2c7c81ae8501684e128adff9818429519e9aeac44716db31c61fb544ac9948. Chain 2 (Bitcoin): anchored in block 957025 (2026-07-07T10:59:31Z), 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/QMBZ92266625.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71d8ccc3102af6f29a2c5d96fd40756e165fa38740b3b7fabc93c4da698e977d. 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/QM7282191570.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2cc725647a926053df6b78da4fb206724168ac99effcdcefae8f37b1855c921. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/QM4TW2287302.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x442d5dd3ea5bdb25aff21f2ab689e6ff424d8008ea0d2ae9a1d8a1922c7fabba. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QMDA72184272.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e1c77ffcc538ff2f16403636e8f9e01e73d04490bd9d3a2b12490dabe2da165. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QMDA62268736.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98d7aaaf62f09879c6292a8cbde331086be885a917d329fefaa2eefda09b3579. 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/QM6MZ2210107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x564d80bd0925d4c8e5ef05ef5f7ef111acb9465e617bf12dc7cfa36076aa2035. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QMDA62268751.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5bbb568e8c7756dc0d53532d84bd8b2ae9b675aba37d717f63425b7a209a222. 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/QMDA62268665.