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 0x4d95c0a57179717134ad298bb42865e650c4a5b0b1f58a7a271af2ef3b2f48fd. 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/7f8f4db3-cd03-4d6a-8f95-faf42157072b.json and https://artists.proofprofile.net/proofs/artist/7f8f4db3-cd03-4d6a-8f95-faf42157072b.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 0x11152a6aaca5e5e2b5bc54f02c5ca4cc6fee23dcc442430d3ba1bdfa0c7c0b89. Chain 2 (Bitcoin): anchored in block 959008 (2026-07-21T13:14:05Z), 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/BRLKT0800002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x997da8b878b0e58e4594c4d1ab19ff07337d5246b430c5ecd7fc65fc58df6a52. Chain 2 (Bitcoin): anchored in block 959008 (2026-07-21T13:14:05Z), 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/BRLKT0800003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5bb33e86f3477bd49df066e92f83d183b8ca91c3c07849d9c67166e5359a2829. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/BRLKT0800004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4aaa2f573e2a06f63b70d2389ff8e4e0407ecf50946d508da2c87604419604a. 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/BRLKT0800012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11152a6aaca5e5e2b5bc54f02c5ca4cc6fee23dcc442430d3ba1bdfa0c7c0b89. 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/BRLKT0800002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9a14f3f7e7515f283346c179a5ecef134c2e46d4c2003ad5a258aa5535a2640. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/BRLKT0800007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8eb67104cb4b118359b783d094d641f5159a8d6180fbb2b4d59735180d2d272. Chain 2 (Bitcoin): anchored in block 959118 (2026-07-22T10:01:58Z), 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/BRLKT0800011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50f4e97f8760f0c416b5a73fd6a6a77691003f793799f4b64cf4bcb73d1fc064. Chain 2 (Bitcoin): anchored in block 960404 (2026-07-31T13:06:57Z), 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/USGFC1008701.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66d58324a86dbe1920f2d0cf049e641947e277f9d2ac67d32e989ba3a440ee10. 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/USGFC1008702.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf95a430182db4c664b8bbeffb69b4666a1a1dd725542760ff98063af96b93329. 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/USGFC1008705.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99d2b84c537246f8956e77204c79f5de4703d2626072ddc340dbc0b9eebfb769. Chain 2 (Bitcoin): anchored in block 960485 (2026-08-01T00:10:46Z), 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/USGFC1008707.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57c0c0bd38fa5d44b6ca4dd8c844f51668c01774c257dfee160854413f42b94d. 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/BRLKT1500007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6e3d5c5b1003497ced2a598910fa417d20416fa790fc80e6cf7c30696681c2c. Chain 2 (Bitcoin): anchored in block 958234 (2026-07-16T03:46:09Z), 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/GB5CD1704801.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3228f1da03edcd42c209ff06712ac647c17bdfccdf8344c5c150fc366c20b51. 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/BRIND0900002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe33d865df1652019c420637d8688d82c7af80fdf9a30f8c8f49bea4f46a5d679. 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/BRUM71200894.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6fbdc4a628a38f82692ebd2369f0faf75b6065f963fc5bf67a99f0aa31541ea. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/BRIND0900005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb63d9b88b1c8757c6cbaf4ffe37eef2b960078199fcdcd4af515c669ff2dd369. 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/BRIND0900011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x939fc00335ebc9ae4dde24c02dcf61f7ecb8789ec6d8c815ae07db8208d67eb0. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/BRIND0900013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02388266f89f8c4f634efc78fec0e6faad70cea7f16c0aa9212323281584cce0. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/BRZ9C1300009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1e451d989b9973f4e4c2969f2fe2945d5c9cbc54f9aae21c8653c7dc9c43fe0. 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/BRZ9C1500004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5bb33e86f3477bd49df066e92f83d183b8ca91c3c07849d9c67166e5359a2829. 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/BRLKT0800004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63a34fb5771490185172c8be8705c612ed9b3fdd9c71886ab74c595d0d081cab. 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/DEEQ71303701.