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 0x4d7bc1203252b0d4edf4e615425beed7d5b82358c353a1aee525e59a4acd64eb. Chain 2 (Bitcoin): anchored in block 954784 (2026-06-22T02:53:59Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/f24974a3-8c3a-48f0-9746-3e45c7f7441b.json and https://artists.proofprofile.net/proofs/artist/f24974a3-8c3a-48f0-9746-3e45c7f7441b.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 0xa16b2c567f7703c314072c37d426adbf1df22cdab1344bf0824817b571c1732c. 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/NLZ7B2300309.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62f1c25017711fc25e5adfefdd7f842a3716846e73c22b1ec231b1367d514ca5. 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/NLZ7B2300308.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2977da7caa5acf66b548908c2495988b42a39566b4e9e06076bc0cb52e64bb2b. Chain 2 (Bitcoin): anchored in block 960370 (2026-07-31T08:38:45Z), 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/NLZ7B2300310.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3459d73084f17b343bad70bae9bff46523a4a9006187b2fc22a8398f12b4919d. 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/NLZ7B2300311.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xebeec8daa5d98a32a6fa9ae00a2f7d4b6ef07fee56db6f2647fb3ee115d38623. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/NLZ7B2300323.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59f51d1d75b92653e278d74d9c310214091f76a27187aaae86c1b9ed70365e62. 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/NLZ7B2300313.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85b3eded10ed8d223da1df8143d76f3fa96e7850d4791c0a31f09745c481fd5c. 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/NLZ7B2300299.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1b285a7dbd9ea81c048ec969f1d1d4fd74e326ba5ba7cd86926eaeee50224d7. Chain 2 (Bitcoin): anchored in block 960225 (2026-07-30T08:04:30Z), 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/NLZ7B2300314.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef8cf2f971989a4f3cb8bc21fc4a7d6b83338bf326c498438ed0f3716e4ddbeb. 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/NLZ7B2300303.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4cad3be67d32f6768cd591768dda00057399175ca567ea029234450ad3a510ad. 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/NLZ7B2300315.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d2f27d2adeacde6c44e6564f45540bddda1f0ae6651bc4d229618f73b669191. 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/NLZ7B2300316.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4c67b2f7bf4c3c8765697a8884d5e79d532d9bd59f3210cafbdae870375c4b3. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/NLZ7B2300318.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec3a883febf82deb211b4acd948b2d6f7c08907358e0e1faa897f7e7602475b2. Chain 2 (Bitcoin): anchored in block 960427 (2026-07-31T15:59:18Z), 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/NLZ7B2300319.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc57ab40278d4bdcbb49adeb87c923972d1459cd1a93d67e9102d6ad10ecb979. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/NLZ7B2300321.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57eb988ed53677692c2f4473c1b3c50eb1779fbbf44e25b342006c9b468fd552. 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/NLZ7B2300322.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3d8487f378a940180db140249bc7e3b5865a3fd0786ca57fcf893fff507d584. 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/NLZ7B2300397.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3e06f674ed8348ff5a3ac59847e5d0830e7b7c803b0d17033905ed2ca69459b. 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/NLZ7B2300432.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e492bdbe58c55f764aa59ecfa3c2270da6d8c75d5092bbd472ad75c568481f1. 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/NLZ7B2300433.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e9ea3b964b77bb9241462faaff268341cf822f2bffd3abc0c1cf9b8b0b24a8e. 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/NLZ7B2300434.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c4a7f8174720e8663631277bd781895bf52e210c2321c59133be1a269026a49. Chain 2 (Bitcoin): anchored in block 960340 (2026-07-31T03:15:04Z), 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/NLZ7B2300435.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3d8487f378a940180db140249bc7e3b5865a3fd0786ca57fcf893fff507d584. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/NLZ7B2300397.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5cf0c0080632e1820f2fa18cc911688b2ecfe24947e2df63b902300dd76de90f. 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/NLZ7B2300298.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3459d73084f17b343bad70bae9bff46523a4a9006187b2fc22a8398f12b4919d. 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/NLZ7B2300311.