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 0xa87642869102ad2db7cea96b824bb7c2ab4ee264c9e14114d28c16dc9be09a3a. 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/a9d63261-ae96-456f-a512-e2477d215eca.json and https://artists.proofprofile.net/proofs/artist/a9d63261-ae96-456f-a512-e2477d215eca.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 0xb8102712c34e038af4df0cd086ae2dc69b45dec333b70be5c16d4731c5a53aae. 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/USHM91111150.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba8949153ade8f43ac74b2ef3a5d75779be04b96c0fa180919c7fceaadbb5bfd. 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/USHM91111151.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce6efbd386a129a995e61d69681cfc2c3f56e0d4ec0b29a76f7af423a32a9fce. 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/USHM91111152.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf81704196aeccd96f0d52538fc1cfd116634074e4814db89fa3d1d6889a3930. 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/USHM91111153.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6dc1aad6aac6de5865024250c6a3708a4e35743da1359d7c3d9497ddeef8ea07. 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/USHM91111154.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4613be7ccce9361ec23a2750f48c70e36ec030be175b1a052badd7a6eae55824. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/USHM91111155.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c1c09b5668f6b314711dd2d566bd47fc416947b57f0dc8fb900f69062ac359d. 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/USHM91111156.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5b0ccd88611178cb6e82bfe3c4a8c17a9870bc6200bb325f7875a50fa6c29df. 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/USHM91111157.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa18777ba0e1fcd876507f2992aec0a5ab29c0943228353d4bee92d11f544e6d2. 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/USHM91111158.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd63902f565ed95940693a93495380e67ef74b4c28d8f6fd6de0eba7f5d3fc44c. Chain 2 (Bitcoin): anchored in block 958943 (2026-07-21T00:27:37Z), 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/QM9A91670269.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b59b24ca1eb19149f34157fc7af20f410ec77298aac2ead03b94d38f6ead991. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T13:14:32Z), 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/QM9A91670274.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1fcf512b3bed63a1820412d5334f21ffbb034cf6be143d08ae1708f5c6dc4c54. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/USHM22340803.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2d1d74925b4b94aa1a00f7c8c98732e8f25fde748e520fbe1a6d66691ecf89b. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/USMH92337993.
Cuando Vuelva a tu Lado (What a Difference a Day Makes)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1cf9994dca93a1af84c1578abcd439287ee72dd78e6c501c47df2f74975ed4c8. Chain 2 (Bitcoin): anchored in block 958716 (2026-07-19T10:15:55Z), 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/USDY42483998.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf72071e82d9abc4ad0607a29a7055faf24e5875b6398cdd19aed5da7f71bd296. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/USL4Q2488223.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x002a53e158ff8da2ad26b9073d9b47d223c8d14426b11fb3a616fda19ede50ca. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/USY242494880.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37591ba90e891a3d372ee8f0c7963e7d9ab3bd81b29178a81bc06b07c911270d. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/USL4R2544732.