thumb|200px|right|Early/Middle Sican tumi knife, 750–1100 AD, held at the Birmingham Museum of Art, it portrays the Sican Lord who abruptly disappeared from Sican art in the Late Sican phase (1100–137
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1e3de9e9b6654786e93d92ac2577aaa813752e8f1f926a5fdc79e84b8192ea1. Chain 2 (Bitcoin): anchored in block 953408 (2026-06-12T19:28:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/df1bdb8d-3ee5-4e9d-a67d-194f715f4090.json and https://artists.proofprofile.net/proofs/artist/df1bdb8d-3ee5-4e9d-a67d-194f715f4090.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Stage Lights (feat. Sibongile Khumalo & Masauko Chipembere)
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xffddd4febaffc42c0655ce721a5f69d2da797cecb9bb06f284a67f2e01ce16f0. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/ZAA010900530.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e4fa2181caf0cb9af522999587d6f15e8e032d45770dec5d3eb7f1b732bd23a. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/ZAA010900532.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5651e782bc346c6685bb57a1e72913d672a1fdb400e4d21ef6db2757f187c033. Chain 2 (Bitcoin): anchored in block 960150 (2026-07-29T21:51:49Z), 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/ZAA010900527.
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 0x7c12898359364625a30c54441fd10ce8ee3ab5be313dd5fd09a9939d15e42cbe. 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/ZAA010900528.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e9426e45bcabc8f364f0f1a0ed052628bf9ada62cc60444f53409a455318708. 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/ZAA010900529.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3bc70e93bd0b2e8cb49871fd6466129945a00177ebcd222fa9426ba55f6d955. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/ZAA010900533.
In Defense of My Art (feat. Reason & Ziyon)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d701ae3619e2781014351097bf5fe7a10fc7e6034118a5f9de31fc3abacf78a. Chain 2 (Bitcoin): anchored in block 958180 (2026-07-15T20:09:19Z), 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/FRP7S1500180.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27a7837ccceaa7e85626569df3a9311cfd339c3b5eccdba7fb271013c4a85ec0. 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/FRP7S1500200.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39303784c1b6d9de90e3b7d8c441ee3aeba28ef098bd3b1e01bfa72a8cb5471d. Chain 2 (Bitcoin): anchored in block 958350 (2026-07-17T04:04:50Z), 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/FRP7S1500210.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9af6480496ebda152c328750a4b7d1e64140afe0a49d21551ba31d449412c6a1. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/FRP7S1500220.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x458f9c226d6d076b57667544f60ac8ddc5558d1bdb019b32fc4ccc6e32807705. 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/FRP7S1500230.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1143b5c3bece9bb63b6826329e0d6bc16c8f3bc77f91a0ddc4bcb1ac219c9d6d. 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/FRP7S1100280.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44babad03581888965dc4cd87579dfb8017c364024d185be1d5e3124ef1e3cbe. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/FR9W11003858.