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 0x5c17852c3742ea542e8fd7e5778ee8914db2a5c9239c4929fff7d65c0cba3975. 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/0a58d0b0-d48b-49a3-9d3b-0f6446acf507.json and https://artists.proofprofile.net/proofs/artist/0a58d0b0-d48b-49a3-9d3b-0f6446acf507.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 0x9fbbca9bcfd5d20bbb4b61a5039e3c52e4d94de1705491f37e460d8feef15321. Chain 2 (Bitcoin): anchored in block 954130 (2026-06-17T19:07:14Z), 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/DEKC41400085.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x265c700616dca301960c1a39cd63542444d236c35196ab73b560bbfd0e5aeb57. 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/DKZVA2200053.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32b78236e734e13eed9d26a189226dfba894d90e2081cfb960a20ba4f93811bf. 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/DKZVA1160911.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5afdc6017775a4756bdf5446a24e3464fa7543aadd79de673917fed0be64b005. 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/DEKC41200992.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x265c700616dca301960c1a39cd63542444d236c35196ab73b560bbfd0e5aeb57. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/DKZVA2200053.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a5ef457b305276f7d689d2fcbdbcece8f53b0de6ca9635ffd0177257e401374. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/DELK10900125.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd662287f5b4402946ca67411a02679edb7981bf2210e8acd9ee54025dbcfcdad. 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/DEKC41600048.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35f9b974cf79fc6e061fe52c37eb3f3fda941532d1030402472fbb5901c3e116. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/DEL712000218.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xffeb7667f24aea14a5f9d4bcf3db1ae6831d3cb3020005a3fced70e582a85be6. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/DEL712000225.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29c9161d4218a62aa3a72a819f10a232d92fed7f0864c02d7cd45e73f93e593b. 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/UKR6V2190502.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x383faec8e64ecbe28ab1f2a1d34061da56482ec9363a51c494a4faf822b6b6b7. 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/DEKC41500024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf083a403dddc29ca26f022b8e54d63d9c708fa2e56475af9ccdf40750b1fcb46. 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/DEAR41415813.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x164d88273d2295f4c8d20d49bc1368a4c1ecb7c0401b802f60452c3911d7cc08. Chain 2 (Bitcoin): anchored in block 960337 (2026-07-31T02:51:48Z), 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/GBBYB1301357.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd68f9288a05bbf1082daf07d1206f9dc176d9350042c2e6623f94475f82a8fe. 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/GBBYB1301358.