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 0x405ab6ef84075106b65629ba6c5aa68513e8c5ec050ad55ab855dad092e0e5b7. Chain 2 (Bitcoin): anchored in block 953742 (2026-06-15T04:47:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/9cf6d66d-69d2-4342-abcd-b886bc4a2d44.json and https://artists.proofprofile.net/proofs/artist/9cf6d66d-69d2-4342-abcd-b886bc4a2d44.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 0x0685cd9d982e40f837ea4e16fa76d4727acb2ae34556b2e47a530c7ad037ceca. Chain 2 (Bitcoin): anchored in block 958726 (2026-07-19T11:47:20Z), 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/TCAGT2310195.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d1a885b023d56ecedafc497cd1b729a9eb6d07958870662b8df04a964eb85b3. Chain 2 (Bitcoin): anchored in block 959037 (2026-07-21T16:59:47Z), 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/TCAGT2310210.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb62b84f288772f312c968e995f87eddea0f851ced153645a0ebd5d1e2698df4. Chain 2 (Bitcoin): anchored in block 958816 (2026-07-20T03:51:05Z), 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/TCAGT2310223.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5acc738de368e2c1c8e6015c9e7d0bc304f239d30a6a0106ee4667f032d6ac6. Chain 2 (Bitcoin): anchored in block 958547 (2026-07-18T12:44:05Z), 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/TCAGT2310228.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2791443e5c588c6d4d97496f9408853be0bf8f2961de40fa4f39187ac38f8b7. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/TCAGT2310231.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14aaa050686448de2f59da4b0af75785c3c3b6b4ceb355fe3645007dde2c57d6. Chain 2 (Bitcoin): anchored in block 958905 (2026-07-20T16:14:34Z), 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/TCAGT2310263.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ae5dd2cdf8ed626b72266a50a5644478fae44875417e23eeac3f92f5ab47145. Chain 2 (Bitcoin): anchored in block 958991 (2026-07-21T10:04:40Z), 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/TCAGT2310267.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4fe9f08f6aefdcf54a97d42b36795ad890e9e9d398b4fdc3b34fce1cd7947de. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/TCAGT2310275.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x560b5aee6ae1fc1092b326ca24d51bf0631eeabe5b409c5f7e5340b53a35344e. Chain 2 (Bitcoin): anchored in block 958955 (2026-07-21T03:03:40Z), 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/TCAGT2310525.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f6f96d7947cd396428f97745a2a20e6c08bb542f54ea29c601f4fb11f245620. Chain 2 (Bitcoin): anchored in block 959069 (2026-07-21T22:32:59Z), 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/TCAGT2310596.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x763615f18bf74f39f161287acd79c1c51f53dbf5d882060bb9b1a72ea99c73d5. 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/TCAGT2310615.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5276b5665d58f12f6562db16d42ac84bbefd10f23f0826c98cb23c6a29d7beee. 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/TCAIJ2420006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd9a89ded970e9c7f8b53822d4976eb52d6654e78d0e2cb6d8b6f7242793e6ff. Chain 2 (Bitcoin): anchored in block 958822 (2026-07-20T04:30:07Z), 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/TCAIK2420022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x767274955ce1a9ba57d0c2329b2673777e1519544738dda9e90c01449ea0fc21. 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/TCAIK2420027.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f9813da6293bacc14ad8c5ad18efeeffbd78db16d4831a204d054de095a96bf. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/TCAIJ2420051.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda49bf84f0315aaa08aeb32892445e1372fd80d17a5d6c2ba0f8c3b4889ff47f. Chain 2 (Bitcoin): anchored in block 958792 (2026-07-19T22:55:52Z), 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/TCAIJ2420055.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ee899329daefe32f24d825b92f75d9d51268970faf8bf6fe9a55fd99dbe8937. 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/TCAIJ2420069.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a4d7e0fd7de12c4faa135c67e0ad1c2d5f2e95cf570fd7820a1887e1ec7aabf. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/TCAIJ2420077.