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 0x8a6eb83b8b693d225961b699183d4c89f762da4bc2455dce09f25f83d8741b6e. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/6cff992b-254d-4735-9345-0a77f4d76830.json and https://artists.proofprofile.net/proofs/artist/6cff992b-254d-4735-9345-0a77f4d76830.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 0xbc06c3136429595c3f88887f3df51710de01c085f1e3af6cc48218b87962f76e. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/ES28A0810216.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6aeaf96d4d3e8f4e01d0a50c81cbc1c540e763145aa37c9c8444c4aaef19fb54. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/ES28A0810217.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93e7135007858a7eccd5cb26538f1135acf7c51a3b9adc44b5de705fe553f573. Chain 2 (Bitcoin): anchored in block 960349 (2026-07-31T05:23:41Z), 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/ES28A0810218.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xecddfe61efb242bfaa6586705c7b1e9aeb7ae0d7f20df07772fee6bbe8f7be9d. Chain 2 (Bitcoin): anchored in block 960258 (2026-07-30T12:45:34Z), 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/ES28A0810219.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcaa38d36e6b0014e507c78d42640bdc1b9e8af342fa07c7b7466283c4d8bf302. 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/ES28A0810220.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f18f0855d676b6f89682244d8ef20a0d533387ab603c2801a09acded3762125. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/ES28A0810222.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46a3f14430b898c298b3554498cffc48b55377d3495e7af72bfd884bfa6becfc. 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/ES28A0810225.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x677c4518929ee5b7ef7f301e3becf29d997976a259234667cb2403f8c31c3079. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/ES28A0910163.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2f7254f8dfe55c17722907c665d27d54981fead2620bcff48afb767dea884a7. 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/ES28A0910201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf43aa944516d9295d8c9a6b0e5ddb5867a3641b7ed0bf6d84f1f1d18e19576e6. 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/ES28A0910208.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9259cec4571d58397ddda7637c2086e8edb49aa05ae669099b4c475c14ccbce4. 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/ES28A0810002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4454efff492c59caf6f63f1cae866cad43df8d95bb96d1b18ce81cf53247ad9. 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/ES28A0810300.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50fdeb4391d89c709da03100470e2b62646024b9377758e43269cb3344bfa852. 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/ES28A0711530.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b80dca183f42e7d45deabf2491568c33cf1f861988fbe6c005594bb99e279d4. 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/ES28A0810304.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x152e360ada447141f5c891c1dade5045a99a0531b779826903cabf5cd48f8c85. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/ES28A0910076.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc732b6ee5913008b354a69b5f75240b103fdb7df9f85acb009b3c0cca9674e6. 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/ES28A0710023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf01f4e35d676fb8976c9512df5ca4c7f275fa854d29efab1a86d6149181e237c. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/ES28A2210569.