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 0xdc17f6fe452f00851ae63447a37652820aad0005f4233f87204b4413e97dcb04. 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/3cfa6ead-6a35-4b8b-9dfc-402283969098.json and https://artists.proofprofile.net/proofs/artist/3cfa6ead-6a35-4b8b-9dfc-402283969098.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 0x0baff4de6765e020c40344f9492b6f2d4bb0996604b5a92870ff81bd75c517e6. 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/QM4DW1792467.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69e139186902470ea9b7a8c2858b8f0e99fdddfa0dcc1d6646c1e9c51974a5bf. 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/QM4DW1792468.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x610fecfa67aa07de8e5b3225e78037552b3b69c5791e148980a6387b80e0762f. Chain 2 (Bitcoin): anchored in block 960296 (2026-07-30T19:11:09Z), 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/QM4DW1792469.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4011502754e27c59368b9a6d199615cb03a9a909052eae5d97ba4d5c480bfde6. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/QM4DW1792470.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99f3fa9d164626cd8b5c6865af6498de912212c2e0a1caee741961d93cfc2a67. 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/QM4DW1792471.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f5d4661dc8d6710b048dcbbc0ff20c24b546ef51b53cce12a742eb7601f8cae. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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/QM4DW1792473.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x563ce4451636058de1d65baaa5bc06df9b5271fcb76634379c78e8f381a168b4. 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/QM4DW1792474.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d14bd94dee9ccfb2be0419f45bd7e878b252962d1c21b04e2accddca27e3815. 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/QM4DW1792476.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ab6565f6517f979433b1606b33def5fe000d073ae7164d9e99590ae26bba476. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/TCADQ1871324.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e3c1b77909c9e6677557ad54498e6134deccd641280eb8cad26287b4b57b6f5. Chain 2 (Bitcoin): anchored in block 960108 (2026-07-29T13:09:35Z), 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/TCADQ1871356.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1170450738dea91e21dca5e08456c9d5bbaa162d34473edb706d67aecbc0caa. 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/TCADQ1871361.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9fb7970aeb7fc6bbf1febfdb50c13e78ced31037077823d4688bc4b8a30fee32. 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/TCADQ1871375.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9eb69f9cde4c2da8f00e719c623c00b44b03f9d3679b8c6b061eb5cd8f88a56c. 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/TCADQ1871396.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3aa3cd816b5e3f140ad4f9e9646e5bd758e4d5dd3e05f4a52085e59d34ffa073. 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/TCADQ1871452.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1fcb0d5d8ec1ead60635a1e7430182988a3f3627b616f759b8b00a372da4862f. Chain 2 (Bitcoin): anchored in block 960113 (2026-07-29T13:38:16Z), 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/TCADQ1871464.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1d854f7fa5d5879d052c03cc41842bc77b3f27913b2709a4b68f81e76c9eba4. 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/TCADQ1871647.